Directions

1. Preheat oven to 350 degrees. Coat cake pans with cooking spray; cover bottoms with parchment, and coat again. Sift together flours and confectioners' sugar. Set aside.
2. Put egg whites, brown sugar, and cream of tartar into the bowl of an electric mixer fitted with the whisk attachment; beat on medium-high speed until stiff peaks form. Gently fold in flour mixture. Divide batter among prepared pans, smoothing tops with an offset spatula.
3. Bake until a cake tester inserted in centers comes out clean. Transfer to wire racks; let cool in pans slightly. Invert cakes onto racks. Remove parchment; reinvert. Cakes can be wrapped in plastic and stored at room temperature up to 1 day.
4. To assemble: Review Cake Assembly instructions. Lift out a gelatin layer, and invert onto a corresponding-size cake layer; remove plastic. Trim if needed. Spread with buttercream (see note below for amounts). Repeat. Stack, placing plain layer on top. Thinly coat tiers with buttercream; chill. Smooth marzipan over tiers. Pipe royal icing around base of each tier. Decorate finished cake with marzipan cherries.
5. Note: Batter amounts and cooking times are for 3-inch-deep round pans. 6-inch-diameter: 2 cups batter per layer (6 cups total), 40 minutes; 10-inch-diameter: 8 cups batter per layer (24 cups total), 40 minutes; 14-inch-diameter: 15 cups batter per layer (45 cups total), 50 minutes. Filling, frosting, and marzipan amounts for each tier are as follows. 6-inch-diameter: 1/3 cup gelatin per layer (2/3 cup total), 3/4 cup buttercream per layer, 1 cup buttercream for exterior (2 1/2 cups total), 1 1/2 pounds marzipan; 10-inch-diameter: 1 cup gelatin per layer (2 cups total), 2 cups buttercream per layer, 2 cups buttercream for exterior (6 cups total), 2 1/2 pounds marzipan; 14-inch-diameter: 2 cups gelatin per layer (4 cups total), 5 cups buttercream per layer, 4 cups buttercream for exterior (14 cups total), 4 pounds marzipan.