Clean and wash spring onions and cut into wide rings. Peel, halve and chop the onion. Wash and halve the tomatoes. Heat the oil in a pan, fry the bacon in it and take it out.
Sauté the vegetable onion in the frying fat for 2-3 minutes. Add spring onions and tomatoes, fry briefly. Remove from heat, season with salt and pepper. Whisk eggs with sour cream, season with salt and nutmeg
Grease a quiche mould (24 cm Ø). Place the pizza dough in the quiche tin with baking parchment facing upwards, carefully peel off the baking parchment. Press the dough together at the edges until it is knobbly. Spread the onion and tomato mixture on the dough and pour egg cream over it. Bake in the preheated oven (electric range: 225 °C/ convection oven: 200 °C/ gas: see manufacturer) on the lower rack for 15-20 minutes. Serve garnished with bacon