4-5 boiled potatoes (with the skin)
Peel the potatoes while they're still warm and cut them into cubes. Chop the onion and cut the sausage into cubes. Fry the onion on some olive oil until golden, then add the sausage and fry for a few minutes. Add the potatoes. Put some salt and pepper according to your taste and stir well. Cook for 15 minutes and add some water, so that it doesn't get burnt.
Eat with some vegetables or meet.