I am cooking for 300 buffet-style in 6 days. I just found out that I will have access to the kitchen only until 1pm and the banquet starts at 6pm. My menu is Roast Beef, Potatoes, green beans. I am not concerned about the beans but need to prepare the meat and potatoes before 1pm and keep it fresh until 6pm. will someone please give me some tips and/or recipes? I'm in a bind!