Peel and wash the potatoes and cut them into thin slices. Heat the oil in a pan and fry the potatoes for 10-15 minutes while turning. Carve tomatoes crosswise, add boiling water, skin, quarter and seed them.
Clean and wash the zucchinis. Cut the zucchinis and garlic sausage into slices. Peel onions and cut into slices. Season the potatoes with salt and pepper, remove from the pan and keep warm.
Fry onion slices and sausage slices in the frying fat. Add tomatoes and zucchini. Fry everything for about 5 minutes and season with salt and pepper. Put the potatoes back into the pan. Put the processed cheese on the vegetables and let it melt for about 1 minute with the pan closed.
Sprinkle with marjoram and serve immediately.