a box of card stock for packaging a predetermined number of food items , such as taco shells and related filling materials , is convertible by the consumer into a tray for holding at least one such food item after preparation and carrying same from stove to table . the box has perforated score line means along which portions of the box are separable from each other to produce the tray , exposing at least one recess shaped to hold the prepared item . the tray has a base that cooperates with the recess to hold the prepared item in a stable upright position .