For the yeast dough, heat milk and dissolve yeast in it. Mix flour, diabetic sweetener and salt. Add yeast milk and fat, knead everything into a smooth dough. Cover and leave to rise in a warm place for about 30 minutes
Knead the dough again and roll out on a greased fat pan (approx. 40x35 cm). Leave to rise for another 15 minutes. For the topping drain the apricots well
Separate eggs. Beat egg whites until very stiff. Whisk egg yolk, 60 g diabetic sweetener and vanilla pulp until white-frothy. Stir in the sour cream, poppy seed and lemon zest. fold in the beaten egg white
Press the pastry base back to the edges of the fat pan, forming a small rim. Pour the poppy seed mixture onto the pastry base and spread it out smoothly. Spread the apricots on top
Bake the cake in the lower third of the preheated oven (electric oven: 175 °C/ convection oven: 150 °C/ gas: stage 2) for 30-35 minutes. Allow to cool and dust with remaining diabetic sweetness