Miss Trunchbull's Chocolate Cake

and 1/2 cups (355mboiling water

and 1/2 teaspoons instant espresso powder

and 1/2 ounces semi-sweet chocolate

and 1/2 cups (355all-purpose flour

and 3/4 cup (550granulated sugar

and 1/4 cups (100unsweetened cocoa powder

and 1/2 teaspoons baking soda

and 1/2 teaspoons baking powder

and 1/2 teaspoons salt

large eggs

and 1/2 cups (360mbuttermilk*

(175mvegetable oil

vanilla

semi-sweet or bittersweet chocolate (finely chopped)

and 1/4 cups (300mheavy cream

(170unsalted butter

and 1/2 cups (170powdered sugar

milk chocolate

vanilla

salt