Oil, for brushing
3 cups cake flour
1/2 teaspoon baking soda
1/2 teaspoon baking powder
1/2 teaspoon salt
1/2 cup buttermilk
1 1/2 tablespoons pure vanilla extract
1 cup unsalted butter (2 sticks, 8 ounces), softened
1 1/3 cups sugar
2 large eggs
3 large egg yolks Chocolate Icing:
6 ounces semisweet chocolate, finely chopped
1/2 cup heavy cream
White Icing:
2 1/2 cups confectioners' sugar, sifted
2 tablespoons light corn syrup
1 tablespoon lemon juice
2 tablespoons warm water
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