Heat the oil in a large flameproof casserole and brown the meat lightly all over. Add all the other ingredients to the casserole with enough water to cover. Bring to a boil, cover, reduce the heat, and simmer gently until the meat is tender, about 3 hours.
Ingredients
4tbsp vegetable oil
2kg (4lbs) boneless pork loin
2 medium onions, sliced
2 cloves garlic, chopped
1 carrot, scraped and sliced
1 stalk celery, cut into 2·5cm (1in) pieces
1 bay leaf
½tsp oregano
½tsp thyme
pinch ground cumin
150ml (¼ pint) red wine vinegar
freshly ground pepper