Purple blueberry cake: Baking with my son (and Legos) for #SundaySupper

OK, so the title should probably be lavender or perhaps lilac blueberry cake, but it's a work in progress and a deep, rich purple is the goal. I am aiming for a purple like Juana Cocina's blueberry sour cream ice cream, which is out of control gorgeous. And I am aiming to create rich color without using artificial food dyes. But the spectacular color was not to be this time. Oh well. My five (and a half) year old son and I had fun baking this cake. So did some of his Lego friends, especially Captain America who defended us from the flour monster.

This week's theme for #SundaySupper is kids in the kitchen. Getting kids in the kitchen early and getting them involved in making some of their own food is a great idea. It builds basic cooking skills like measuring, reading recipes (my boy isn't there yet, but he will be), some basic math, some nutritional information, but more important it creates a sense of comfort and confidence in a kitchen, like this is a place that you know and feel at home in. The best way to control what and how much you eat is to learn to cook it yourself. Without the confidence built from familiarity, the kitchen can seem intimidating. (I've written about fear in the kitchen before.) Thankfully, my boy won't grow up with that fear. 

I asked him what he wanted to make for this blog post, and he decided he wanted to make a cake and frosting from Williams-Sonoma's The Kid's Cookbook, which has lots of great somewhat simplified recipes (good for adults too) that are almost all made from scratch (which is really important to me; I am afraid I don't much care for "recipes" that start with processed, packaged foods). From the basic recipes in there, we modified them a bit to try to get color into the cake and the frosting. Like I said, I am not ecstatic about how the color turned out and will probably have to try a few more variations until I get it as purple as I want it to be, but it's a tasty cake anyway. (As you will no doubt notice, I am not skilled when it comes to decorating cakes. Perhaps one day I will learn to do better, for now, I'll just muddle through.)

Ingredients

FOR THE CAKE

• butter for greasing the cake pan (about 1 Tbsp)
• flour for the pan (about 2 Tbsps)
• 1 3/4 cups all-purpose flour
• 2 1/2 tsps baking powder
• 1/4 tsp salt
• 1/2 cup butter, room temperature
• 1 cup sugar
• 2 eggs
• 1 1/2 tsps vanilla extract
• 1/3 cup pureed frozen blueberries (I really like Wyman's frozen wild blueberries)
• 1/3 cup milk

FOR THE FROSTING

• 12 Tbsps butter, room temperature
• 3 cups confectioner's sugar (sifted)
• 2 Tbsps pureed frozen blueberries, strained
• 2 Tbsps heavy cream
• 1 1/2 tsps vanilla extract
• plus about a cup of blueberry jam for the inside of the cake 

Instructions

FOR THE CAKE

Preheat the oven to 350 degrees Fahrenheit. Then grease and flour an 8-inch springform pan:

Measure flour, baking powder, and salt into a medium bowl and mix it together. Set it aside for now. 

Add sugar and butter to a mixer bowl. Beat with the paddle attachment of your stand mixer until the butter and sugar are creamy. 

Add the eggs and vanilla and continue beating the mix until smooth. Reduce the speed on the machine and add the blueberry puree and the milk. Finally, add the flour mixture. 

Combine everything quickly, but completely, and spread the batter into your springform pan (note, the batter isn't very runny, you will want to smooth it out with a spatula). And, because I trust the farmer who raises my eggs, I let my son sop the pot. (I wouldn't do this with industrial eggs anymore.)

Bake it in the oven for 45 to 50 minutes. When it's done (test for doneness with a toothpick inserted in the center of the cake; if it comes out dry, the cake is done), take it out and let it cool in the pan on a baking rack for 15 minutes. 

Then, get the cake out of the pan and let it cool completely on the baking rack. Go ahead and get out your butter to soften and blueberries to defrost during this time. (My boo and I watched Captain America while it cooled; it was on the fourth of July that we baked this after all.)

FOR THE FROSTING

To make the frosting, puree about a quarter cup of blueberries and strain the puree. I went ahead and poured the heavy cream through the strainer to try and pick up more of the color. 

Add the butter, cream, blueberry puree, vanilla, and confectioner's sugar to your mixer bowl.

Beat until the frosting is fluffy. 

Cut the cake into two layers. Spread a layer of blueberry jam on the bottom layer. Then gently place the top layer onto the bottom layer. Try to line them up as evenly as possible. 

Spread a thin layer of frosting all over the cake. This layer is called the crumb layer and will basically glue down the crumbs. Then spread a thick layer of frosting all over. To make my super fancy border, spoon frosting into a plastic bag, cut a tip off one corner, and push out one little dollop of frosting at a time all around the outside rim of the cake. 

Then invite some friends over to eat it. 

And of course, it wouldn't be #SundaySupper without all the other great meals that my fellow bloggers have put together this week. Check out all these tasty meals that can get your kids in the kitchen:

Start your day:

• Panko Encrusted French Toast Sticks ~Doggie At the Dinner Table 
• Pineapple Not-Upside Down Muffins ~In the Kitchen with Audrey
• Bacon, Egg & Sausage Breakfast Cups ~Daily Dish Recipes 
• Buttermilk French Toast with Homemade Cinnamon – Raisin Bread ~What Smells So Good

Healthy snackers:

• Snack Attack: 3 Healthy Choices for Little Nibblers ~Cindy’s Recipes and Writings
• Fruit Salad in an Orange Cup ~Mama’s Blissful Bites 

Main meal:

• Whole-wheat Pretzel Dogs ~Family Spice
• Poblano Mac ‘N Cheese ~Juanita’s Cocina
• Coconut Chicken and Shrimp ~Super for a Steal 
• Lunie and Mini-me’s Grilled Pizza ~Cravings of a Lunatic
• Hedgehog Meatballs and Chili Dog Pie ~Cooking by the Seat of our Pants
• Walking Tostada ~Shockingly Delicious
• Mini Sausage Rolls ~Small Wallet Big Appetite
• Mini Corn Dog Muffins ~In The Kitchen With KP
• Mexican Black Bean & Quinoa Burgers with Homemade Guacamole ~Cupcakes and Kale Chips
• Threaded Spaghetti Hot Dog Bites ~Damn Delicious
• Golden Potato Patties ~My Trials in the Kitchen 
• Grilled Chicken Wings in Sesame Flavors ~The Queen’s Notebook
• Spaghetti Tacos ~Girlichef
• Parmesan Corn on the Cob ~Home Cooking Memories 
• Yum Yum Salmon  ~Family Foodie
• Pad Thai ~Meal Planning Magic 
• Chicken Tortilla Bake ~Mrs. Mama Hen

Sweet treats:

• Chocolate Slab ~Happy Baking Days 
• Chocolate Chip Cut-Out Cookies ~Chocolate Moosey
• Self-Crust Coconut Pie ~Magnolia Days
• Fresh Cherry Clafoutis ~The Meltaways
• Wolf’s Wonderful Peanut Butter-Brownie Fudge Sundaes ~The Weekend Gourmet
• Cookies and Cream Ice Cream ~The Messy Baker Blog
• Healthy Creamy Caramel Apple Parfaits with Greek Yogurt ~Sue’s Nutrition Buzz
• Chocolate and Salted Caramel Pudding Pops ~Hezzi-D’s Cooks and Books
• Chocolate Cheese Turnover ~Basic and Delicious 
• Chocotorta Vintage Kitchen Notes 
• Oatmeal and M&M Cookies ~That Skinny Chick Can Bake
• Tropical Popsicles ~Pippi’s in the Kitchen Again
• Carrot Cupcakes ~Diabetic Foodie

Our #SundaySupper live chat will start at 3 pm EST. Follow us on twitter by using hashtag #Sundaysupper or using Tweetchat.

Jam update: How I went wrong and a recipe for peach-plum jam

A while back I wrote about making blueberry jam with maple syrup and lemon zest, but I have learned much about jam-making since then and I must confess that I was wrong. The basic recipe is just fine, but it turns out my technique could use a lot of improvement.

Now, you ask me, "Tora, how did you find out you were wrong? What should we be doing differently?"

Well, about two weeks ago (I think it was two weeks ago), Mike, Sebastian, and I decided we would go to Borders and see if we could find anything good at the going-out-of-business sale. We don't usually pick over scraps of dying stores like vultures, but it's a book store. If there was a 10-step program for book addiction, we might be candidates for it.

As we looked around, Mike found a book that he thought I might like: The Blue Chair Jam Cookbook by Rachel Saunders. This charming, lovely book is probably all you will ever need to become a master jam/jelly/marmalade maker. It has gorgeous photos, lots of great information about techniques, and recipes that range from the utterly simply and sublime to the complex and sophisticated. And within about 10 minutes of sitting down to read, I discovered that I have been doing it wrong. So, let me explain my mistakes and pass on some of my new-found knowledge to you.

1. I've been using the wrong kind of pot. Ideally, you should use a copper pan that's 11 inches at the base, 15 inches at the rim, and 5 inches high with a 11- to 12-quart capacity. Now, copper pans are not currently in my budget, as dearly as I would love to have one. What I gleaned from this information is that I need a lot more surface area. So I broke out my stock pot, which is definitely deep enough and has a 10-inch diameter. Not perfect, but I've already gotten better results. (If anyone feels especially generous, a copper pan would be a much appreciated Christmas gift.)
2. I've been using the wrong application of heat. Instead of low and slow, I should be cooking this stuff hot and fast to keep as much of the fruit's flavor and texture intact. The correct way to do it is to heat the mixture of fruit and sugar slowly at first, just until it starts to bubble and release a lot of juice, and then crank up the heat to get it up to a pretty fierce boil. What you are trying to accomplish is a lot of evaporation (which explains why you need a lot of surface area in your pan). While it cooks, you need to keep stirring frequently, both to aid evaporation and to ensure that the jam doesn't stick to the bottom and burn. Note that this will be extremely messy.
3. My testing for doneness has a lot to be desired. Rachel Saunders suggests doing this instead: Place a saucer with five metal spoons in the freezer. When you are ready to test your jam for doneness, take your pot off the heat, transfer a small amount of jam to one of the frozen spoons and return it to the freezer for a minute or two. When the bottom of the spoon feels neither hot nor cold, inspect the sample in the spoon. It shouldn't run but sort of clump up in a jelly-like blob on the spoon. If it doesn't, discard test spoon 1 and put the pot back on the heat for another five minutes or so and test again. The cooking process for jam (there are differences for jelly and marmalade, so be aware of that) will take about 15-30 minutes tops. 
4. I like her method of preparing the jars for preservation, but I am still not completely sold on it. Usually, I would transfer jam to hot sterilized jars that I have boiled, place the lids on them, and boil them for another 15 minutes. She recommends sterilizing the washed jars in a 250-degree oven for at least 30 minutes, adding the jam, closing the jars, and placing them back in the oven for another 15 minutes. It's a lot easier method than boiling the jars, but so far, every batch I have made this way has had at least one jar that didn't seal. Of course, that means I get to try the jam right away, which is great, but it rankles a little bit. 
5. The last clear technique difference is her method of flavoring the jam with herbs. I like to wrap up my herbs in a piece of cheesecloth and let it boil in the jam, whereas she prefers to add sprigs and let them steep in the hot jam for a few minutes after cooking and then fish them out. I haven't made up my mind on this one yet. I tried her method, adding some basil to a recent batch of plum-peach jam after it had cooked, but although the basil was extraordinarily fragrant (from my garden!), I can't taste it in the jam at all. So I will probably experiment a bit more before making my decision one way or another. 

I've applied these modifications to three recent batches of jam—blackberry with lemon verbena, peach-plum with basil, and my blueberry with maple syrup and lemon—and I am definitely getting better results. The texture is better, the flavor is brighter, and the set is much better. I also love that I can get a jam in a lot less time. What's a bit of drag is that the yield seems to be a bit smaller, but I can live with that to get awesome jam. Here's a recipe for a jam experiment I tried with plums and peaches. The flavor is beautiful: bright, fruity, a little tangy, basically everything you get from a really good peach or plum eaten while dripping over a sink at the height of summer.  

Peach-plum jam with basil  

Yields about four eight-ounce jars 

• 500 grams peaches, peeled, cut into 1-inch pieces (discard the stones)
• 500 grams plums, cut into quarters (discard the stones) (any kind of plum will probably work for this, but I used red plums, which created a dark red jam; just be mindful that if you use, for example, greengages, the color may not be very pretty)
• 6 deciliters sugar
• juice from two lemons
• 4-5 basil stems (optional, but nice)

1. Background prep: Place a saucer with five metal spoons in the freezer, and sterilize your jars using whatever technique you prefer (keep them hot as you make the jam).
2. Layer the fruit and sugar in your jam pot (starting and ending with a layer of sugar).
3. Let the fruit-sugar mixture sit for at least an hour, up to overnight (refrigerate if you want to do this).
4. Add the lemon juice.
5. Heat the mixture slowly until the fruit produces a lot of juice, and it has started to bubble. 
6. Bring the heat up to high and stir continually to keep the jam from burning. Expect copious amounts of steam and a lot of spatter. If you have an apron, this would be a good time to wear it. (I really need to get one of those.)
7. Cook at high heat for about 15 minutes (skim off the foam).
8. Test for doneness: Take the pot off the heat, get a sample of jam from the pot and transfer it to a frozen spoon. Place the sample in the freezer for a minute or two. Touch the bottom of the spoon, if it's neither hot nor cold, it's time to inspect the doneness of the jam. It should not run, but be gelatinous. If it runs, put the jam back on the heat for another five minutes and test again. Keep testing until you reach doneness.
9. When the jam is done, take it off the heat and add your basil sprigs and let it sit for five to 10 minutes. Then remove the basil and pour the hot jam into your hot jars (be sure to leave at least an inch at the top) and sterilize them, using a hot water bath or oven as you prefer. 
10. When you let the jars cool, you will hear little popping noises as they create a vacuum seal. If one of the jars doesn't seal (you can tell if you can depress the lid with your finger and it pops up again), just let it cool and enjoy it right away. The rest will be good for several months. 

A note on cooling: Don't move jam around a lot while it cools. One of the things it does as it cools is creates a sort of lattice structure. If you disturb that structure while it's forming, the jam won't set very well (or possibly at all).

Update: Check out the National Center for Home Food Preservation for more information about keeping your jams and jellies safe. 

Blueberry jam with maple syrup and lemon zest

For some updates on techniques and a recipe for plum-peach jam with basil, click here. 

I haven't posted in a while. For the Independence Day weekend, Mike, Sebastian, and I drove to Auburn Hills, Michigan (a little north of Detroit) to visit Mike's sister, her family, and their dad for the holiday (the drive takes 10 and a half hours; my little boy is a champ!). Instead of cooking and eating good local food, we subsisted mainly on junk food and candy bought at rest stops along the Pennsylvania and Ohio turnpikes, feeling bloated and gross the whole way. (Sebastian, of course, loved this, but the guy is four, so I can't blame him for having tastes geared primarily toward straight-up salt and sugar.) I did have one really excellent meal: My brother-in-law Russ made some amazing fall-off-the-bone ribs and served them with BBQ sauce, grilled corn, and baked beans. We gorged ourselves on these delectable treats and moaned with discomfort for several hours after dinner. It was totally worth it.

Before we left, I had wanted to make a batch of blueberry jam to make sure that the harvest didn't go by without preserving at least some of it, but I ran out of time. I love blueberries. They may be my favorite berry. I am especially fond of wild lowbush blueberries, but they are hard to come by here in Virginia. When I was a kid in Sweden, I spent much of my time roaming around the woods like a small wild animal, getting damp and muddy and pretending I was a hero of some kind: a knight one day, Robin Hood the next. In my long rambles, I discovered treasured spots where wild blueberries grew in great masses, and I spent many hours seated among the plants, plucking berry after berry and savoring each one. I miss my blueberry spots, especially now that I cook. If only I could wander out into the woods and collect and gather blueberries, bring them home, and preserve them for winter. (I was told once that my Icelandic grandfather Sigurdur was a legendary berry picker; he could fill baskets faster than anyone, fingers moving so fast they blurred.)

But I must settle for domesticated highbush berries, which produce larger fruits that are not quite as deeply flavorful (still good, but not magic). Thankfully, one of my favorite farms, Reid's Orchard, grows berries and fruit organically (although they aren't certified), using integrated pest management techniques and caring for their soil and land in a way that will preserve it for the future (and it shows, just take a look at their peaches--they taste and smell as good as they look).

After recovering from the Michigan trip for a few days, I finally made it out of the house to get food on a steamy Thursday. I went to the Herndon farmer's market and decided to get some blueberries from Reid's. I lucked out because they had a lot of them, so I bought six pints. I had had this idea of making jam flavored with maple syrup and lemon zest. Foods from the same area often taste particularly good together--and sugar maples typically live where blueberries grow, so the combination sounded good. Obviously lemons and blueberries violate that principle, but they are good together. The acidity of the lemon just sparks the flavor of blueberries (as lemons do with so many things).

It was actually so hot and humid the day I bought the blueberries that my camera fogged up. 

So here's how I made my blueberry jam with maple syrup and lemon zest. I started with

• 3 liters blueberries, picked over to remove any soft berries, stems, leaves, or anything else you wouldn't want to eat, rinsed, and finally drip-dried for 10 minutes or so (better yet, use a scale, you should have 1.5 kilos of berries) 
• 700 milliliters sugar
• 200 milliliters real maple syrup
• 1 lemon, washed
• 1 tablespoon pectin, mixed with a little water to make a smooth paste

I spread a layer of sugar on the bottom of the pot I planned to use for jamming.

Then I layered blueberries over the sugar, added another layer of sugar, and zested some lemon over the sugar.

At the second layer, I added the maple syrup instead of sugar and zested some more. 

I added more berries and ended with a final layer of sugar and zest. (In other words, one layer of sugar on the bottom of the pot and one to top it all off.)

I covered the berries and sugar with the lid (ants are quite a problem in summer) and let it sit for a little over an hour (you could let it sit up to 24 hours in the refrigerator). Then I set the pot on low heat. At first, not much happened but eventually I could see a rim of liquified berry juice starting to rise around the edges of the pot, followed by a completely wet mass slowly simmering away. (Note that this isn't a project you do quickly, it can take several hours to reach the jelling point. Pick a lazy, rainy day when you aren't going to leave the house to make the jam. Maybe make some bread while you are at it.) 

  

I added the mixture of pectin and water to the pot and let the mass just simmer away. (At one point, I did get a boil over, so I had to turn down the heat a bit. Almost anything that's made with a lot of sugar has a tendency to get feisty if too much heat is applied.) I skimmed regularly. (Once when making jam as a kid, I made the mistake of not skimming. It left the finished product with a very unpleasant, bitter aftertaste. So if you decide to make jam, don't skimp on skimming.) Oh, and here's a tip to ease your skimming: Keep a bowl of cold water near the stove, dip your skimmer into the cold water before you skim, and then clean off the scum in the cold water, and skim again. You will probably want to replace the water from time to time. 

While the mass simmered, I cleaned and sterilized my jars in boiling water. (You can re-use your jars, but you must use new lids every time. The rubber that creates the seal doesn't hold up to multiple uses. You can probably find boxes of lids where you would buy other canning/jamming equipment.)

You can keep the jars in the hot water on low while your jam continues to simmer. Eventually, I started testing my jam to see if it was ready. How to test for readiness? Get a teaspoon of the liquid in the pot and spread it on a plate. Let it cool for a few minutes, and scrape your spoon through the smear on the plate. If the liquid immediately fills in the lines where the spoon scraped through, you are nowhere near done. If the lines don't fill in immediately, but do eventually, you are getting closer but you aren't there yet. If it bunches up into a jelly-like mass, you are ready to go.

When the spoon scrapes through, the liquid immediately refills the line. This is nowhere near done. 

The liquid isn't filling in as quickly now. The white of the plate shows just a little longer. Progress, but not done. 

The liquid no longer fills in where the spoon has scraped through, and you can create a little clump of jelly. Finished!

When the jam had reached the point where it was finished, I added the juice from the lemon (both for flavor and to help preserve the jam). (I strained it to make sure I wasn't adding seeds.) Then the next step was to add the jam to my warm and clean jars, close up the jars, and boil the jars to vacuum seal them. 

One thing to remember when you add the jam to the jars: Always leave at least an inch of space at the top of the jar. Otherwise, you won't be able to create an effective vacuum. And the vacuum is one of the main reasons that these jars will last for up to year. (That is, if you don't eat them before then. I am almost out of the strawberry jam I made already!)

I've wrapped my jars in newspaper because I don't have a rack to keep the jars stable (yet). 

Ah, pride and joy!

Update: To make sure your jams and jellies are safe to eat, check out the National Center for Home Food Preservation.