Put flour, 100 g sugar, vanillin sugar, butter in flakes, salt and egg yolk in a bowl and knead with the dough hooks of the hand mixer to a crumbly mass. At the end knead with your hands to thick crumbles. Grease a tart tin (bottom approx. 18.5 cm Ø, top approx. 23 cm Ø) and put half of the crumbles into the tin. Line the tin with the crumbles, press the dough firmly and cut off overlapping edges. Chill the tart for about 20 minutes. Knead 2 tbsp. grated coconut and liqueur under the remaining crumbles and also refrigerate
Meanwhile, put the apricots in a sieve, drain well, place on kitchen paper and pat dry with a 2nd layer of kitchen paper. For the icing mix sour cream, 4-5 tablespoons sugar, eggs and sauce powder
Sprinkle 2 tablespoons of grated coconut on the tart base and cover with apricots. Pour the glaze over the apricots. Sprinkle with remaining crumbles and bake in the preheated oven on the lower shelf, (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 30 minutes. Bake the tart for 5-10 minutes on the middle shelf until done. Remove from the oven and leave to cool in the tin on a cake rack. Whipped cream tastes good with it