Chop 3 cloves of garlic, mix with oil in a small bowl.
Score the skin of the pork knuckle and rub with garlic/oil mix. Liberally dust with salt.
Place in baking tray with 2cm of boiling water. Cook in oven at 180C for 2hrs, topping up the water when necessary.
Re-wet knuckle with juices before draining water. Coat knuckle with salt again. Turn oven up to highest setting and crisp the skin right up.