We're having 20 pounds of deli meat from Katz's for a Superbowl Party and I would love recommendations as to how to reheat the pastrami and corned beef. We've ordered whole pastrami and corned beef that we will slice, (my husband has considerable expertise in that department), but we know they have to be steam heated. So, what to do? Keep them whole? Slice them first? Use the oven with a roasting pan full of boiling water? Stove top with a vegetable steamer? You get the gist. All advice welcome.