Separate the whites from the yolks. Yolks are broken with 1 cup Cream sugar and egg whites with 1/2 cup sugar snow, and then mixed. Add lemon juice, the oil, flour, vanilla and lemon zest. Pour into a buttered and floured baking dish, sprinkle top with chocolate and gently stir with a fork to mottle the dough strips. On top sprinkle with crushed walnuts. Bake in preheated oven at 180 degrees until ready. * 1 cup = 200 ml * In the recipe not raising agents are used.