To serve from the freezer: Thaw in the fridge overnight. Put in a pan and bring to the boil, then simmer gently for 30 minutes. Add the beans. Or reheat in the oven for ½- 1 hour, adding the beans near the end of cooking.
Set the oven to 160°C/320°F/Gas Mark 3. Heat 1 tablespoon of the oil in a large frying pan, add half the meat and fry until browned all over. Tip the meat and juices into the casserole. Repeat with another tablespoon of oil and the rest of the meat.
Add the last of the oil to the pan along with the onions and fry gently 5 mins. Add the peppers, garlic, chorizo and spices and fry for 5 mins then add the tomatoes and tomato purée. Add to the meat, put the casserole on the heat.
Bring the to the boil, cover, then transfer to the oven and cook for 2-2½ hours, until the beef is really tender.
Stir the beans and warm through on the hob for 5 mins. Season to taste. Serve with parsley and crusty bread.