Grease a fat pan (approx. 32 x 39 cm; at least 3.5 cm deep) and dust with flour. Mix crème fraîche and 75 g sugar, add grated coconut. Break chocolate into pieces and melt with butter in a hot water bath.
Leave to cool at lukewarm.
Beat the eggs, flavour, 200 g sugar and brown sugar for approx. 1 minute with the whisk of the mixer until foamy. Stir in the chocolate-butter mixture. Mix flour, cocoa and baking powder and stir in briefly.
Spread the dough on the fat pan. Spread the coconut mixture with a spoon in large blobs. Bake in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for 35-40 minutes (the dough should be brownie-like - i.e. still moist inside).
Let it cool down. Whipped cream is delicious with it.