Ingredients: Unsalted butter, room temperature, for pans 3 cups all-purpose flour, plus more for pans 3 cups granulated sugar 1 1/2 cups unsweetened Dutch-process cocoa powder 1 tablepoon baking soda 1 1/2 teaspoons baking powder Coarse salt 4 large eggs 1 1/2 cups low-fat buttermilk 1/2 cup plus 2 tablespoons safflower oil 2 teaspoons pure vanilla extract Directions Preheat oven to 350 degrees. Make the cake: Butter three 9-inch round cake pans, and dust with flour, tapping out excess. Sift flour, granulated sugar, cocoa, baking soda, baking powder, and 1 1/2 teaspoons course salt into the bowl of a mixer. Beat on low speed until just combined. Raise speed to medium, and add eggs, buttermilk, 1 1/2 cups warm water, oil, and vanilla. Beat until smooth, about 3 minutes. Divide batter among pans. Bake until cakes are set and a toothpick inserted into the center of each comes out clean, about 35 minutes. Let cool in pans set on a wire rack for 15 minutes. Turn ou...