3 1/3 cups cake flour (not self-rising)
¾ cup (1 ½ sticks) unsalted butter, softened
2 ¼ cups sugar
3 large eggs, at room temperature
6 Tbsp. red food coloring
3 Tbsp. unsweetened cocoa
1 ½ tsp. vanilla extract
1 ½ tsp. salt
1 ½ cups buttermilk
1 ½ tsp. cider vinegar
1 ½ tsp. baking soda
6 Tbsp. all-purpose flour
2 cups milk
2 cups (4 sticks) unsalted butter, softened
2 cups sugar
2 tsp. vanilla extract
Method for cupcakes:
Preheat oven to 350 degrees.
In a small bowl, combine the flours. Set aside.
In a large bowl, on the medium speed of an electric mixer, cream the butter until smooth. Add the sugar gradually and beat until fluffy, about 3 minutes. Add the eggs, one at a time, beating well after each addition. Add the dry ingredients in three parts, alternating with the milk and vanilla. With each addition, beat until the ingredients are incorporated but do not overbeat. Using a rubber spatula, scrape down the batter in the bowl to make sure the ingredients are well blended. Carefully spoon the batter into the cupcake liners, filling them about three-quarters full. Bake for 20-25 minutes, or until a cake tester inserted into the center of the cupcake comes out clean.
Cool the cupcakes in the tins for 15 minutes. Remove from the tins and cool completely on a wire rack before icing.
Method for frosting:
In a medium-size saucepan, whisk the flour into the milk until smooth. Place over medium heat and, stirring constantly, cook until the mixture becomes very thick and begins to bubble, 10-15 minutes. Cover with waxed paper placed directly on the surface and cool to room temperature, about 30 minutes.