Knead 1,150 g flour, diabetic sweetener, cold fat in pieces and 4-5 tbsp. ice-cold water into a smooth dough. Cover and chill for about 30 minutes.
Divide the dough into 5 equally sized pieces. Roll out each piece to a round shape (approx. 12 cm Ø) on a little flour. Grease the cake tin (approx. 8 cm Ø) and line it with the dough. Press up at the edge. Prick the base several times
Bake the cakes in the preheated oven (electric oven: 200 °C/ convection oven: 175 °C/gas: level 3) for 18-20 minutes. Remove and let cool. Then turn out of the moulds and allow to cool completely
Wash the raspberries if necessary and carefully dab dry. Mix curd and sour cream until smooth. Flavour with sweetener. Fold in 2/3 of the raspberries
Fill the tartlets with raspberry quark. Decorate with the remaining raspberries and chopped pistachios