Blend the whole wheat biscuits. Mix it with walnuts and melted butter. Press the mixture into the bottom and sides of a 26 cm mold. Leave it in the fridge for 40 minutes. For the first layer, mix all the ingredients except grapes and spread on the biscuit in the mold. Place the grapes randomly.

Bake in a preheated 180 degree oven for 40 minutes. Take the mold out of the oven and let it cool. For the second layer, melt the dark chocolate with margarine in a double boiler and remove from the stove. Add the whipped cream and mix. Separate the yolks and whites of the eggs. Mix the whites until they become foamy.

Add the yellows to the chocolate mix. Add the whipped egg whites with a wooden spoon and mix. Spread the mixture on the cake that has cooled

Bake in a preheated 180 degree oven until the chocolate hardens. After cooling, decorate with grape seeds, sprinkle with powdered sugar and serve by slicing.