Hot Dog Bun - Yeast dough bun. In fact, it is bread that has certain standard parameters, not more than 27 cm in length. The bun is not round, as for a hamburger and elongated like a small baguette. Such a bun is being prepared especially for fast foods, namely for a hot dog. Before filling the bun, it should be cut lengthwise without cutting, then open and lightly grill.