4 twelve layer Recipes

cherry gelatin, lime gelatin, lemon gelatin, orange gelatin mix, lime gelatin (2nd lime), strawberry gelatin, sour cream, water

egg yolks at room temperature 30 minutes, whole milk, pure vanilla extract, sugar, divided, all-purpose flour, salt, egg whites at room temperature 30 minutes, fine-quality 60%-cacao bittersweet chocolate, finely chopped, water, eggs, separated , at room temperature 30 minutes, salt, sugar, divided, unsweetened cocoa powder, hazelnuts (3 1/2 oz), egg whites at room temperature 30 minutes, salt, cream of tartar, sugar, water, sugar, instant-espresso powder

egg yolks at room temperature 30 minutes, whole milk, pure vanilla extract, sugar, divided, all-purpose flour, salt, egg whites at room temperature 30 minutes, fine-quality 60%-cacao bittersweet chocolate, finely chopped, water, eggs, separated , at room temperature 30 minutes, salt, sugar, divided, unsweetened cocoa powder, hazelnuts (3 1/2 oz), egg whites at room temperature 30 minutes, salt, cream of tartar, sugar, water, sugar, instant-espresso powder, coffee and mocha buttercreams (recipe to follow), equipment : 3 (15-by 10-inch) 4-sided sheet pans (1/2 inch deep