3 tablespoons Dutch processed cocoa powder
1 1/2 teaspoons baking soda
1/2 teaspoon salt
12 tablespoons unsalted butter, at room temperature
2 1/4 cups granulated sugar
3/4 cups vegetable oil
3 large eggs, at room temperature
1 1/2 teaspoons pure vanilla extract
1 1/2 teaspoons red wine vinegar
1 tablespoon red food coloring
1 1/2 cups buttermilk, at room temperature
Preheat the oven to 350 degrees F. Butter and flour 2 (9-inch) cake pans and line each pan with a round of parchment paper.
Whisk together the flour, cocoa powder, baking soda and salt in a small bowl
Cream the butter, sugar and oil in a stand mixer fitted with the paddle attachment until light and fluffy. Add the eggs, one at a time, scraping down the sides of the bowl and beat until incorporated. Beat in the vanilla, vinegar and food coloring.
Add the flour mixture to the batter in 3 batches alternating with the buttermilk, mixing well after each addition. Divide the batter evenly between the prepared pans and bake for 30 to 40 minutes or until a wooden skewer inserted into the center comes out with a few moist crumbs. Cool on a baking rack for 15 minutes before removing the cake from the pans. Let cool completely before frosting. Slice each cake into 2 layers and frost.
1 cup whole milk
1/2 vanilla bean, split and seeds scraped
7 tablespoons all-purpose flour
3 sticks unsalted butter, at room temperature
1 1/2 cups superfine sugar
Combine the butter and sugar in the bowl of a stand mixer fitted with the whisk attachment and beat until the mixture is very fluffy and the sugar is totally dissolved, about 6 minutes. Add the cold paste, a few tablespoons at a time to the butter mixture and whip until light and fluffy.