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Put the pork in a large, lidded ovenproof dish with the remaining ingredients and mix well to coat. If you can, chill and marinate overnight.
Heat the oven to 140C/120C fan/gas 1. Put the lid on the dish and cook on the middle shelf for 4 hrs. Check after 2 hrs and spoon over the juices. Check the meat is tender by pulling it apart with two forks. If it resists, cook for 1-2 hrs more.
Mix the ingredients for the salsa in a bowl and warm the tacos. Shred the pork and remove any fat or sinew. Serve with the cabbage, avocado, soured cream and salsa.