Grease a fat pan (approx. 32 x 39 cm, at least 3.5 cm deep) and sprinkle evenly with breadcrumbs. Cut off the rhubarb ends, remove hard fibres if necessary. Wash the rhubarb and cut into pieces of approx. 2 cm
Separate eggs. Cream butter, 150 g sugar, vanillin sugar and 1 pinch of salt. Add the egg yolks one after the other and stir in. Mix flour and baking powder. Alternate with the milk and stir in briefly. Spread the rather firm dough on the fat pan - this works especially well with an angle pallet or a cake server
Beat egg whites until stiff. Add 200 g sugar and beat until the sugar has dissolved. Carefully fold in rhubarb pieces and grated coconut. Rhubarb-Coconut-Ba
Bake in the preheated oven (electric oven: 175 °C/circulating air: 150 °C/gas: level 2) on the lowest rack (gas: see oven manufacturer) for 30-35 minutes. Remove from the oven and let cool in the fat pan on a cake rack. Dust with icing sugar and cut into pieces. Whipped cream tastes good with it