* Note: Most caterers listed below provide catering both with and without supervision. Be sure to ask for the HKA hashgacha. These caterers are only certified as kosher with a mashgiach on site. Warning: There have been numerous instances of food prepared in kosher kitchens and reheated in non kosher ovens without kosher supervision. Kosher caterers must have a mashgiach, a kosher supervisor, at the event to be considered kosher, even if prepared in a kosher kitchen.