Wash, pluck and chop the oregano. Cut the chillies lengthwise, remove seeds, wash and chop very finely. Chop olives coarsely. Peel garlic and chop very finely.
Soak the rolls in cold water for about 10 minutes. In the meantime peel and finely dice the onion. Squeeze the bread roll well and knead with onion, minced meat, egg, oregano, chilli, olives and garlic. Season with approx. 1 level tsp salt and approx. 1⁄2 tsp pepper.
Form 8 meatballs from the minced meat mass with wet hands. Heat the oil in a large pan. Fry the meatballs in it (possibly in portions) at medium heat for 8-10 minutes on each side.