Buttercream frosting is a delicious setting for the berry stars and stripes of this patriotic cake. The recipe appears below and in the cookbook "The Perfect Cake." Photo by: Carl Tremblay/America's Test Kitchen
June 27, 2018 10:46:12 AM
A big flag sheet cake is the perfect Fourth of July dessert; and at a time when patriotic-colored berries are at their best, vibrant blueberries and red raspberries are a fitting topping.
We knew that our workhorse yellow sheet cake was the ideal base for the cake, so our challenge when developing this recipe was simply determining the best frosting.
Whipped cream, the most common topping for this summer cake, had little staying power and the juicy berries bled into the cream. A simple American buttercream in the form of our vanilla frosting worked much better and ably glued the stars and stripes to the cake.
Once our cake was topped with berries, we were able to bring the flag to the table. You may have extra frosting after coating the tops and sides of the cake. Wait until a few hours before serving to arrange the berries to ensure that they taste fresh at serving time.
Start to finish: 1 hour and 30 minutes, plus 2 hours to cool the cake
Yellow sheet cake:
2 1/2 cups (10 ounces) cake flour
1 3/4 cups (12 1/4 ounces) sugar
1 1/4 teaspoons baking powder
1/4 teaspoon baking soda
3/4 teaspoon salt
1 cup buttermilk, room temperature
3 large eggs, separated, plus 3 large yolks, room temperature
10 tablespoons unsalted butter, melted and cooled
3 tablespoons vegetable oil
2 teaspoons vanilla extract
Pinch cream of tartar
5 cups vanilla frosting:
1 pound (4 sticks) unsalted butter, each stick cut into quarters and softened
1/4 cup heavy cream
1 tablespoon vanilla extract
1/4 teaspoon salt
4 cups (16 ounces) confectioners' sugar
5 ounces (1 cup) blueberries
15 ounces (3 cups) raspberries
Nutrition information per serving: 765 calories; 379 calories from fat; 43 g fat (24 g saturated; 2 g trans fats); 199 mg cholesterol; 295 mg sodium; 92 g carbohydrate; 3 g fiber; 65 g sugar; 6 g protein.
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