For the vegetable sausage quiche, line the quiche pan with the shortcrust pastry and pre-bake for approx. 10 minutes at 180 °C.
For the filling, chop the onion, zucchini, bell bell pepper, carrots and sausage into small pieces, quarter the leek and cut into strips. Saute everything in a little oil and season with salt and pepper.
For the glaze, mix the sour cream with the 3 eggs and season with salt, pepper and nutmeg. Spread the sausage-vegetable mixture on the pre-baked pastry base, sprinkle with the cheese and cover evenly with the glaze.
Bake in the oven for about 30 minutes.