Cook the Spätzle in plenty of boiling salted water for about 15 minutes. Clean and wash the leek. Peel onions. Cut both into rings. Wash and chop the tomatoes. Grate cheese roughly. Drain spaetzle, let it drain
Heat the oil in a large frying pan. Fry the onions until crisp and brown. Take them out. Steam the leek in the frying fat for about 5 minutes while turning. Steam the tomatoes briefly. Season with salt and pepper
Spätzle with salt, pepper and nutmeg season. Mix in a greased casserole dish with tomatoes, leek, onions and half of the cheese. Sprinkle the rest of the cheese over it
Bake under a hot grill or in a preheated oven at the highest level until golden brown. Green salad tastes good with it
For 2 people, halve the amount. Then simply melt the cheese in the closed pan