It’s sort of a meat slurry made from undesirable or inaccessible cuts. After butchering, the bones are roasted then cooked down in water for over 12 hours 

The meat falls off the bones where it’s them finely chopped or ran through a food processor. We add mustard, vinegar, ketchup, hot sauce & Worcestershire sauce along with boiled in broth onions & potatoes

It’s great over rice