By Evan Bleier While you won’t see unsavory bits like lips included on the list of ingredients on the back of most packages of hot dogs, most companies will disclose that their dogs are made with something called “mechanically separated poultry.” What exactly is mechanically separated poultry — or MSP, for short? The USDA has the answer: “Mechanically separated poultry is a poultry food product produced by high-pressure machinery that separates bone from poultry skeletal muscle tissue and other edible tissue by first crushing the bone and then forcing bone and tissue through a sieve or a simil…