Chocolate Mayonnaise Cake

Step 1 Preheat oven to 350°F. Butter and flour three 8-inch-diameter cake pans with 1 1/2-inch-high sides. Combine chopped chocolate and cocoa powder in medium metal bowl. Add 13/4 cups boiling water and whisk until chocolate is melted and mixture is smooth. Step 2 Sift flour, baking soda, and baking …