Heat the oven to 90 degrees if you're going to cook the pork for 8 hours or to 120 degrees if you're cooking the meat for 3-4 hours.
Brown the pork in a pan in some olive oil, put some salt and pepper. Take off the pan and put in an oven proof pot or a pan. Mix sugar, soy sauce and five-spice powder together and rub on the meat all over it in the pot. Add the water or juice in the pot. Put the lid on and in the oven it goes.
When cooked of your choice, let the pork stand for some minutes before tearing and pulling it down with two forks. Put in a bowl and drizzle with some juice from the pot. Keep the stock from the pot.
1 cup water
1 cup white wine vinegar
2 tbs salt
Baked sweet potatoes