Powdered sugar, egg yolks and lemon zest and mix gently break down the table until almost doubled. Shattered solid whites mixed with flour and starch, add salt and pour the beaten egg yolks with sugar. Of the biscuit mixture is rolled 1-2 leaves and baked at very low heat so that they remain soft, then cut into squares. Lopsided cream mixed with strawberries (or raspberries). To this mixture was coated on 2 pieces and crackers are spliced. Finally, each sweet is smeared with jam and dusted with grated chocolate.