Preheat over to 150℃
Remove Skin from ham, leaving the skin on the shank in tack
Place ham on rack in baking dish.
Cover shank end with aluminium foil
Place ham on oven shelf (or hooded bbq)
Pour water into the tray to the depth of 2cm
Cook on 150℃ for approximately 3hrs. Check after 1hr to make sure the ham isnt burning. If it is lower the temperature and keep checking every 30 minutes. You will want your glaze to caramelise though (see pictures of fully cooked ham).