All buffets use stainless steel and plastic food pans to store the food in. Food pans can be either hot or cold. Buffet food pans come in different sizes for different configurations at a salad bar or other buffets. Buy them wholesale at the restaurant supply superstore.
Food pans are the essential part of any buffet or breakfast bar. Quality pans will last you longer than cheaper knockoffs. You also want to make sure your food bar looks inviting for your guests.