Preheat the oven to 200°C. In a bowl mix together the minced beef, garlic, parsley, parmesan, salt & pepper, egg and breadcrumbs and mix and shape into sixteen balls.
In a frying pan and over a moderate heat add the olive oil and sauté the meatballs until brown, set aside to drain on kitchen towel. Add a little oil and over a moderate heat saute the onions until soft. Add the tomatoes and simmer for twenty minutes. Add the basil, season and turn into a gratin dish. Add the meatballs, buffalo mozzarella and top with the parmesan cheese.
Place in the oven and bake for twenty minutes until brown and crisp. Serve garnished with a few basil leaves.
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