Mix flour with sugar, vanilla sugar and 1 pinch of salt. Add the egg and 200 g butter in pieces. First use the dough hooks of the hand mixer, then work into crumbles with your hands.
Wash, halve and stone the apricots (drain canned fruit well). Cut the apricots into slices. Wash, clean and chop the strawberries.
Distribute the fruit in a flat, greased, ovenproof dish (approx. 26 cm Ø). Sprinkle crumbles evenly over the top and bake in a preheated oven (electric range: 200 °C/circulating air: 175 °C/gas: level 3) for 25-30 minutes.
Remove the crumble and dust with icing sugar. Decorate with lemon balm. Serve with vanilla sauce or ice cream.