Turn the slow cooker on to high or low. Place a large frying pan over a high heat and add the oil. Toss the pork meat in the flour and season with salt and freshly ground black pepper. Fry in the hot oil until browned all over. Spoon into the slow cooker dish. Add the onion, red pepper and chilli to the pan and fry for a few minutes before adding the spices. Fry for 1 minute then spoon into the slow cooker dish along with the cocoa powder, chopped tomatoes and red kidney beans. Stir and cover. Cook for 4 hours on high and 8 hours on low.
Once cooked, season with salt and pepper, and serve with rice, lime wedges and a spoon of sour cream.
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