The Stomach Turning Process Of How Hot Dogs Are Made

It's National Hot Dog Day, meaning that businesses across the country will give away the American favorite for free.

A camera crew from Discovery Channel's How It's Made stepped inside a John Morrell factory to reveal the process for how hot dogs are made.

It isn't pretty, as the photo on the right illustrates.

The factory processes a mindblowing 300,000 hot dogs an hour.

The recipe starts with beef and pork trimmings. Later, a whole bunch of other er, stuff is added.