Squeeze the sausage meat from its casings into a large mixing bowl. Add the mince, chilli flakes, garlic, , and half the chopped onion, and mix thoroughly. Season with salt and pepper. Sprinkle the flour over a chopping board and shape the mixture into walnut-sized balls.

Preheat the oven to 190?C/gas 5. Heat 1 tablespoon of oil in a large non-stick frying pan and fry the meatballs until brown all over. Transfer to a large ovenproof dish. Heat the remaining oil in a large non-stick frying pan and fry the meatballs until brown all over. Transfer to a large ovenproof dish. Heat the remaining oil. Add remaining onion, pepper and paprika and saut? for 2-3 minutes. Stir in the passata, bringing to the boil and cook for a further 3 minutes. Season. Pour sauce over meatballs and cook, uncovered, in the once.