It is not based on the cube rule of food.
A food can be classified by which faces of a cube the outer layer of carbs populate. In the case of a hot dog, it is a taco, since the bottom and two sides are the carb structure.
A food can be classified by which faces of a cube the outer layer of carbs populate. In the case of a hot dog, it is a taco, since the bottom and two sides are the carb structure.
A slice of any of them is a toast.
No inconsistency there.
Though I prefer "pizza" to "toast".