Knead flour, butter in pieces, icing sugar, salt, egg yolk and 1-2 teaspoons of cold water to a smooth dough. Wrap dough in cling film and chill for about 30 minutes
Roll out the dough thinly on a floured work surface. Cut out approx. 18 circles (approx. 6.5 cm Ø) close together. Grease 18 troughs of a mini muffin tray (24 troughs) and line with the dough. Press the rim firmly and prick several times with a fork. Refrigerate again for about 30 minutes.
Bake the tartlets in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 15-20 minutes until golden brown. Remove the tartelettes from the oven, remove them from the troughs and let them cool down on a cake rack
Finely grind the pistachios in the universal chopper. Wash and clean the strawberries and puree about 75 g strawberries. Cut remaining strawberries into strips. Whip cream until stiff. Sprinkle in vanillin sugar, sugar and cream setting agent. Stir in the strawberry puree and fill the cream into a piping bag with perforated spout. Pour the cream into the tartelettes and decorate with strawberry strips and pistachios. Dust with icing sugar and serve immediately
waiting time approx. 1 1/2 hours