Choc Birthday Cake

Ingredients

• For cake layers:
• 1/2 cup milk (not nonfat)
• 1 tablespoon distilled white vinegar
• 4 ounces semisweet chocolate, chopped
• 1 stick unsalted butter, cut into pieces
• 1 cup water
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 cups sugar
• 2 large eggs
• 1 teaspoon vanilla
• For frosting:
• 1 1/2 cups sugar
• 1 cup heavy cream
• 4 ounces unsweetened chocolate, chopped
• 1 stick unsalted butter, cut into pieces
• 1 teaspoon vanilla