Separate two eggs. Coarsely chop the chocolate coating separately. Melt the dark chocolate coating and 150 g butter in a saucepan at low heat. Whisk 2 eggs, 1 egg yolk, salt and 150 g sugar with the whisk of the hand mixer for 4-5 minutes until thick and creamy. Mix 130 g flour and 1 level teaspoon baking powder in a bowl. Stir the chocolate mix into the egg mixture. Stir in flour mixture
Melt white couverture and 150 g butter in a pot. Chop the nuts finely. Add 2 eggs, 1 egg yolk, 120 g sugar and salt and whisk for 4-5 minutes until thick and creamy. Slowly stir in the white chocolate mix. Mix 150 g flour and the rest baking powder. Fold in flour-mix and nuts
Put light and dark dough in patches on the greased and floured fat pan of the oven (32 x 39 cm). Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 25 minutes
Beat 4 egg whites and salt until stiff, adding 200 g sugar. Beat the beaten egg whites until they are shiny and the sugar has dissolved. Pour the beaten egg whites into a piping bag with a medium-sized perforated spout. Remove the cake from the oven and spray the beaten egg white in small tuffs relatively close together. Bake the cake at the same temperature for another 10-15 minutes. Remove from the oven and allow to cool on a cake rack