Southern-style pork and beans

Spray a large, wide-based saucepan with cooking spray and fry the onion over a medium heat for 4-5 minutes, stirring occasionally, until softened and lightly browned. Add the pork and gammon, season with pepper and cook for two minutes, stirring constantly. Add the garlic, paprika and chilli powder and cook for a few seconds, stirring. Tip the tomatoes and beans into the pan, and stir in the tomato purée and mustard. Pour over the stock and bring to a gentle simmer. Cook for 20-25 minutes, stirring occasionally, until the pork is tender and cooked through and the sauce is thick. Season to taste and stir in half the parsley. Sprinkle the rest over just before serving. Serve with the yoghurt.