Description
When it comes to indulgent desserts, few can resist the allure of a well-made cake. And when that cake boasts the vibrant flavor of blackberries, it’s a true delight for the senses. Join us on a delectable journey as we explore the world of Blackberry Cake, from its mouthwatering beginnings to the art of crafting this sumptuous treat. From the essential ingredients to the finishing touches, we’ll uncover the secrets to creating a cake that’s sure to impress. So, preheat your ovens and prepare your taste buds for a sweet adventure like no other.
Ingredients
Blackberry Cake:
8 ounces (227 g) buttermilk (or regular milk with 1 Tbsp white vinegar added) (Make sure your buttermilk is fairly fresh, the older buttermilk is the higher the acidity level)
3 ounces (85 g) vegetable oil
3 large eggs
1 tablespoon lime zest (About 1 lime)
1 tablespoon lime juice
12 ounces (340 g) all-purpose flour
11 ounces (312 g) granulated sugar
1 teaspoon salt
1 teaspoon baking soda
8 ounces (227 g) unsalted butter
2 tablespoons all-purpose flour (For dusting on blackberries)
4 ounces (113 g) blackberries (You can use frozen, but don’t thaw them)
Blackberry Puree:
16 ounces (453 g) fresh or frozen blackberries
1 tablespoon lime zest
2 tablespoon lime juice
1 tablespoon corn starch
1/8 teaspoon salt
Blackberry Buttercream Frosting
24 ounces (680 g) unsalted butter room temperature (You can use salted butter but it will affect the taste and you need to leave out additional salt)
24 ounces (680 g) powdered sugar sifted if not from a bag
2 teaspoons vanilla extract
6 ounces (170 g) pasteurized egg whites room temperature
2 ounces (57 g) blackberry puree (You can add more if you want to)
1 drop Americolor electric pink food coloring (Optional)
Instructions
Blackberry Puree:
Combine lime juice and cornstarch, to make a slurry, mix until no lumps. Mix with blackberries and salt in a saucepan.
Use an immersion blender to make the filling smooth, turn on heat and being to cook down the berries, keep stirring to keep the puree from cooking too quickly on the bottom of the pan.
Once puree has thickened up slightly, remove from heat stir in zest and transfer to a bowl to cool to room temp. You will use about 6 Tablespoons of the puree to add to your cake, the rest will be used to color and flavor your buttercream.
You will end up with about 1/4-1/2 cup of puree for the buttercream. If you choose to strain the seeds out of all of the puree, add a couple extra ounces of berries to account for the loss in straining.
I chose to leave the seeds in for the cake, and strain the seeds out for the buttercream, seeds can be left in for the buttercream too, your choice. Store leftover puree in the fridge for up to a week or freeze for 6 months.
Blackberry Cake
Heat oven to 335ºF/168º C. Prepare two 8″ round cake pans with cake goop or another pan release that you prefer.
Measure out buttermilk. Place 4 oz in a separate measuring cup. Add the oil to the 4oz of buttermilk and set aside.
To the remaining milk, add your eggs, lime zest, gently whisk to combine, keep the lime juice separate, you will add this at the end.
Place the flour, sugar, baking soda, and salt into the bowl of your stand mixer with the paddle attachment. I’m using my Bosch universal plus mixer but you can use whatever mixer you have.
Turn the mixer onto the slowest speed (setting 1 on Kitchen Aid mixers). Slowly add chunks of your softened butter until it is all added then let everything mix until it looks like coarse sand.
Add your milk/oil mixture all at once to the dry ingredients and mix on medium (speed 4 on KitchenAid) for 1 full minute to develop the structure. Don’t worry, this will not over-mix the cake, because it is AP flour you do not need to mix as long as cake flour (more gluten, less time needed)
Scrape the bowl. This is an important step. If you skip it, you will have hard lumps of flour and unmixed ingredients in your batter. If you do it later, they will not mix in fully.
Slowly add in the rest of your milk/eggs/zest ingredients in 3 parts, pour in the lime juice with the last addition of liquid, stopping to scrape the bowl one more time halfway through. Your batter should be thick and not too runny. Fill your pans 1/2 full with cake batter.
Spoon about 2 tablespoons of room temp puree over the batter, use a small spatula or knife to gently fold the puree in to create a swirl effect into the batter.
Add floured blackberries to the top of the batter, do not push them down in as their weight will cause them to sink anyway as the cake heats up.
I always start by baking for 30 minutes for 6″ and 8″ cakes and 35 minutes for 9″ and larger cakes and then checking for doneness. If the cakes are still really jiggly, I add another 5 minutes. I check every 2 minutes after that until I’m close and then it’s every 1 minute. Cakes are done when a toothpick inserted in the center comes out with a few crumbs.
After cakes have cooled for 10 minutes or the pans are cool enough to touch, flip the cakes over and remove from the pans onto the cooling racks to cool completely. Wrap in plastic wrap and chill in the freezer.
Once the cakes are chilled in the freezer and feel firm you can trim off the brown edges from the sides (optional) and fill with your blackberry buttercream and fresh berries. Crumb coat the cake with buttercream, chill then apply your final coat of buttercream. Top with fresh berries and lime zest.