Clean and wash the spring onions and cut the light and green parts separately into wide rings. Peel, halve and chop the onions. Wash and halve the tomatoes. Heat oil in a pan. Fry the minced onions for about 4 minutes until crumbly. Add diced onions and fry for another 3-4 minutes. Add light spring onion rings, chunky tomatoes and cherry tomatoes and simmer for 2-3 minutes. Remove from heat, season with salt and pepper
Mix eggs and 100 g of sour cream and season with salt and nutmeg. Grease a quiche dish (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 at the edges inwards until it is knobbly. Spread the onion and chopped tomato mixture on the dough and pour egg-cream over it
Bake the quiche in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) on the lower rack for 20-25 minutes, cover the surface with aluminium foil after about half the baking time
Drain the olives and cut them into small pieces. Mix 150 g sour cream, olives and milk, season with salt and pepper. Remove quiche from oven and sprinkle with spring onion green before serving. Serve with sour cream-