Knead 300 g flour, 1 pinch of salt, 1 egg and lard. If necessary, knead in 2-3 tablespoons of cold water. Chill for about 30 minutes.
Peel and chop the onions. Dice bacon and drain in 2 tbsp. hot oil. Add onions and fry for about 10 minutes until transparent, season with salt and pepper. Let cool off. Whisk sour cream, 6 eggs, salt, pepper and nutmeg
Grease a tart mould (approx. 26 cm Ø). Roll out the dough on a little flour (approx. 30 cm Ø). Line the tin with the dough and press up the edges. Spread the onion mixture and egg icing in the mould. Bake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3) for 40-45 minutes
Drink: cool Federweisser