Knead flour, butter in pieces, approx. 1/2 teaspoon salt, 1 egg and 1-2 tablespoons ice-cold water. Put in a cool place for about 1 hour
Clean, wash and cut the spring onions into rings. Peel and chop the onions. Mix quark, sour cream, cream cheese, 125 g Gouda and 4 eggs. Season with salt, pepper and nutmeg. Fold in onions
Roll out the dough to a circle (32 cm Ø) on a floured surface. Line a greased quiche or tart dish (approx. 28 cm Ø) with the dough and press it up at the edges. Prick several times. Pre-bake in the preheated oven on the 2nd rack from below (electric oven: 200 °C/ convection oven: 175 °C / gas: level 3) for 15-20 minutes
Mix the cheese icing and add to the dough. Sprinkle the rest of the Gouda and roasted onions over it. Bake at the same temperature for another 30-35 minutes