Mix milk with vinegar and set aside to curdle. In a large bowl, sift and mix flour, sugar, cocoa powder, baking soda, baking powder, and salt.
Add eggs, oil, vanilla extract, and milk to the dry ingredients. Slowly pour in boiling coffee while whisking.
Grease two 9-inch cake pans, divide batter evenly, and bake for 70-75 minutes.
For the frosting, grate dark chocolate and set aside. In a saucepan, mix sugar, cornstarch, cocoa powder, espresso powder, salt, and water. Cook until thickened, then add grated chocolate and butter.
Cool frosting until it holds its shape. Split cooled cakes, layer with frosting, and assemble the cake.
Use a lazy Susan and offset spatula for a whimsical finish. Enjoy with milk or indulge in the Bruce Bog Trotter method.
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