For the base, place flour, butter in flakes, egg, salt, vanillin sugar, 100 g sugar and 50 g ground almonds in a mixing bowl and knead into a smooth dough using the dough hooks of the hand mixer. Roll out to a circle (approx. 30 cm Ø) on a floured work surface. Put into a greased tart tin (26 cm Ø, with lift-off base) sprinkled with flour, press down and prick several times with a fork. Chill for about 30 minutes. In the meantime, wash the apricots, drain them, cut them in half and remove the stones.
Warm up the jam in a small pot. Sprinkle the base with 50 g ground almonds and line with the apricots (arching upwards). Brush with apricot jam, sprinkle with whole almonds. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower rack for approx. 35 minutes. In the meantime, beat the egg whites until stiff, sprinkle with 100 g sugar. Pour into a piping bag with a large star-shaped spout. Take the tart out of the oven, splash the tuffs on the edge. Increase the oven temperature (electric oven: 225 °C/ convection oven: 200 °C/ gas: level 4) and bake for another 4-5 minutes. Remove from the oven, place on a rack and allow to cool in the mould.
In the meantime, beat the egg whites until stiff, sprinkle with 100 g sugar. Pour into a piping bag with a large star-shaped spout. Take the tart out of the oven, splash the tuffs on the edge. Increase the oven temperature (electric oven: 225 °C/ convection oven: 200 °C/ gas: level 4) and bake for another 4-5 minutes. Remove from the oven, place on a rack and allow to cool in the mould. Dust with icing sugar
1 1/2 hours waiting time