Bring 2-3 l salted water (1 teaspoon salt per litre) to the boil. In the meantime peel and chop the onion. Clean, wash and slice the savoy cabbage. Cut cabbage into strips from the stalk.
Heat the oil in a frying pan. Remove the salsicce from the skin and fry in the oil until crumbly. Fry the onion briefly, season with pepper and remove. Cook pasta in boiling salted water according to package instructions.
In the meantime, fry the cabbage in the frying fat, then continue to steam over a low heat for about 5 minutes. Season with salt and pepper.
Whisk the eggs in a bowl. Season with salt, pepper and nutmeg. Stir in mineral water and drain the pasta. Add salsicce and noodles to the savoy cabbage and heat up briefly. Pour the eggs evenly over the top and let them falter at low heat, turning them carefully several times. Grate cheese finely. Arrange noodles and sprinkle with parmesan.