Peel the potatoes, wash and dab dry. Fry in hot oil, turning occasionally for about 15 minutes. Season with salt and cayenne pepper. In the meantime clean, wash and cut spring onions into longer pieces.
Add to the potatoes 5 minutes before the end of the cooking time. Clean the mushrooms, rub with kitchen paper and cut into slices. Add to the potatoes and fry for another 5 minutes, turning occasionally.
Wash and dice the tomato and finally fold it in. Season everything with salt, pepper and dried herbs. Drain the mozzarella balls. Chop the herbs. Serve both loose and on the pan.
Garlic crème fraîche tastes good with it. Sprinkle with coloured pepper as desired.