4 hazelnut layered coffee cake Recipes

sugar, butter, eggs, jumbo, milk, all-purpose flour, baking powder, salt, vanilla, brown sugar, cinnamon, hazelnuts, ground, hazelnuts, chopped, flour, melted butter

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

vegetable oil for greasing, all-purpose flour plus additional for dusting, granulated sugar, egg whites, at room temperature for 30 minutes, almonds or hazelnuts, toasted (see cooks note, below), chopped, and finely ground in a food processor (3/4 cup), fine-quality bittersweet chocolate (not unsweetened), chopped, water, instant-coffee granules, chilled heavy cream, confectioners sugar, kirsch or cognac, garnish: grated bittersweet chocolate or chocolate curls