Melt the butter and let it cool down a little. Roughly chop the chocolate. Roughly chop the chocolates. Mix flour, sugar, 35 g cocoa, baking powder and vanillin sugar in a bowl. Place the eggs in a mixing bowl and whisk until creamy
Allow butter to run in while stirring. First stir in flour mixture, then crème fraiche. Fold in 100 g chocolate. Pour the dough into a greased springform pan (26 cm Ø) sprinkled with flour, smooth it down and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 25-30 minutes. After 8-10 minutes of baking time, sprinkle a good 1/3 of the chopped pralines evenly on the cake
Remove the tart from the oven, place it on a cake rack, remove it from the edge of the springform pan immediately and let it cool in the pan. Remove from the tin and place on a cake plate. Spread the surface evenly with double cream. Chill for about 30 minutes.
Warm the cream in a small pot, add 125 g chocolate and coconut oil. Melt at low heat while stirring. Remove from the heat and let it cool down a little. Spread evenly on the cake. Refrigerate again for about 1 hour. Sprinkle with the remaining chopped pralines and dust with 1 1/2 teaspoon cocoa powder
waiting time approx. 3 1/2 hours