For the short pastry, put flour, baking powder, 60 g diabetic sweetener, salt, 1 egg and butter in flakes in a mixing bowl and knead into a smooth dough using the dough hooks of the hand mixer. Knead again with your hands. Cover and chill for approx. 30 minutes. In the meantime, wash the grapes, drain well and remove from the panicles. Mix 4 eggs, sour cream, yoghurt, 60 g diabetic sweetener and sauce powder.
Roll out the dough on a floured work surface to a circle (32 cm Ø), put it into a well greased form (lift-off form 28 cm Ø), press the rim and prick the base several times with a fork. Sprinkle with ground almonds. Spread grapes on top and pour the sour cream icing over it. Sprinkle with almond slivers. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 45 minutes on the bottom shelf
Waiting time approx. 2 hours. / 2 1/2 BE