NOTE: It is important to have a hearty bun, because of the juiciness of the sandwich. If your bun is light, fluffy, and soft, the juices may soak right and you’ll have a soft sandwich. Toasting the buns helps keep them sturdy too. Depending on the size of the hoagie buns you get, you may have to snip the ends of them off to fit nicely in a 9×13 pan.