Pre-heat the oven to 180/160C fan. Get an oven-proof pan, place it on medium heat, and drizzle a little bit of oil into it. Grab your chopped pork belly pieces and transfer them into the pan. Fry for 5 minutes to golden each side of the pork belly. Pour in the rest of the pork belly ingredients (sugar, garlic cloves, ginger, star anise, shaoxing wine, soy sauce, chinese 5 spice, pepper, and water). Give it a good stir, place a lid on top of the dish, and then transfer into the oven for 2 hours. Then remove the lid and place back into the oven for a further 30 minutes. Feel free to add in a touch more water if you think that it's beginning to burn. Don't confuse colouring with burning though! As long as there's about an inch of liquid at the bottom, you're all good!