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Heat 1 tsp oil in a large frying pan. Add the meatballs and cook, turning often, until browned. Remove from the pan.
Tip the onions into the pan with the remaining oil and a pinch of salt and cook until very soft, 10-15 mins. Add the garlic and rosemary and cook for 2 mins more.
Add the tomatoes and return meatballs to the pan. Simmer for 10 mins until the sauce has thickened and the meatballs are cooked through. Season and serve with the pasta, sprinkle with rosemary.