Turn the slow cooker on to high or low. Heat the oil in a large frying pan and add the pancetta or lardons. Cook over a medium heat for about 5 minutes until golden. Remove with a slotted spoon and add to the slow cooker dish. Toss the pork in the flour and season with salt and freshly ground black pepper. Fry in the oil until browned all over. Remove with a slotted spoon and add to the slow cooker dish.
Add the vegetables and garlic to the frying pan and sauté in any remaining oil for 3-4 minutes. Transfer to the slow cooker dish and mix in the chopped tomatoes, cannellini beans, vinegar, caster sugar and herbs. Season with salt and pepper, and cover with the lid. Cook on high for 4 hours or low for 8 hours. Once cooked stir in the chopped parsley and serve.
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