I have a pre-cooked one. Still trying to figure out how to cook it. But I *think* that the idea is to warm it up but keep it moist, so foil for a bit (and maybe some glaze in the bottom of the pan), and then foil off at the end to make all look a bit golden.

If you have a good butcher, they might be able to help you with cooking times and instructions. I told DH to get cooking instructions and they told him to look on the net...so hopefully your butcher will be more helpful!