what temp to cook a ham in a roaster
1 Place the ham, skin side up, in a large roaster. 2  Add 5 cups of water. 3  Place the cover on the roaster or if it does not have a cover, use foil to cover tightly. 4  Place in an oven preheated to 375Â°F. Turn oven up to 500Â°F and leave for 10 minutes only. Bake until internal temperature reaches 155Â°F. 2  Allow ham to rest for 15 minutes before carving. 3  Internal temperature should rise to 160Â°F during this time. 4  If using a glaze, the glaze should be applied during the last 30 minutes of cooking.