Chop the couverture, melt with the fat over a warm water bath while stirring. Coarsely chop the nuts. Add sugar and vanillin sugar to the chocolate mixture and whisk until creamy for about 5 minutes. Stir in the eggs one by one. Mix flour and baking powder and fold into the egg mixture. Fold in 250 g nuts. Put the dough into a greased pan of the oven (32 x 39 cm) lined with baking paper and spread it out smoothly.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 20-30 minutes. Let cool on a cake rack. Roast 100 g nuts in a pan without fat until golden brown, take them out and let them cool down. Mix cream cheese, cream, icing sugar and lemon juice. Spread the mixture loosely on the cooled down cake. Drizzle with honey and sprinkle with nuts
30 minutes waiting time