Preheat the oven to 200°C/180°C fan/Gas 6. Heat the oil in a small pan and cook the onion for 4-5 minutes until softened. Add the tomatoes and simmer rapidly for about 5 minutes until they soften and become thick and pulpy.
Stir in the cola, honey, Worcestershire sauce and paprika, bring to the boil and simmer for 10-12 minutes until the sauce has thickened.
Place the pork in a roasting tray and cover with the sauce, turning to ensure the meat is well coated. Roast skin-side up for 1 hour until cooked through. There should be enough sauce but cover the meat with foil if it looks dry.
Carve into thick slices and finish off by barbecuing or grilling for 8 minutes on each side or until nicely coloured.
Cook smart. Cheaper meat joints work well on the barbecue. We've used pork belly but a shoulder of lamb, stuffed and rolled, is also great grilled.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.