Sausages are a tasty, versatile ingredient in a wide range of dishes, but most of us are a little leery of how they’re made. That’s because you’re never quite sure what store-bought sausages contain.

The pork oozed out of the stuffer machine's spigot and was quickly inserted into the cutter. Within seconds, the sharp wheel-like contraption produced one sweet Italian sausage link after another, ...