Cut 200 g butter into pieces. Mix flour, icing sugar, butter and egg first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Wrap the dough in foil and chill for about 30 minutes. Wash the apricots, grate them dry, halve and stone them. Caramelise the sugar in a pan until golden. Add 1 tablespoon butter and stir until the butter has melted. Spread the caramel immediately on 9 tartlets (approx. 12 cm Ø/ 3.5 cm high).
Place apricot halves (3 halves per tartlet) with the cut surface on the caramel. Roll out the shortcrust pastry 2-3 mm thin on a floured work surface and cut out 9 circles (12 cm Ø), kneading and rolling out the pastry again. Place circles over the apricots and press them firmly at the edges. Bake the tartlets in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes. Allow the tartlets to cool for 2-3 minutes and then turn them out onto plates. Dust with icing sugar