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Heat the oil in a large frying pan. Fry the onion, garlic and ginger for about 10 mins. Stir in the spices, pour in the vinegar and stir well. Tip into the slow cooker (we used a 6.5-litre model) and add 1 tsp salt and about 20 turns of a black pepper mill. Add the pork joint, turn in the mixture to coat it, then arrange it in the pot so it is rind-side down. Cover and cook on low for 7-8 hrs.
Meanwhile, make the salad. Mix the carrot with the onion, tomato and coriander, then toss just before serving with the lemon juice and oil.
Remove the rind and fat from the pork and skim all the fat from the juices, then shred the meat into the juices. To serve, put some meat and salad on one side of a chapati, then top with the raita and chutney, fold over and eat with your hands.