Preparing the Potatoes
Chop the potatoes into three or four pieces, about 2 square inches each. Place in the roasting pan around the lamb. Distribute pieces of lard around them, and then sprinkle salt, thyme and garlic over.
Pour sherry wine over the lamb. It will seep into potatoes as everything cooks. Pour the cup of water over to one side of the pan, so that you do not rinse the condiments off the lamb or potatoes.