Directions

1. Combine all ingredients for rub (ancho chile powder, paprika, ground black pepper, dry mustard, ground coriander, dried oregano, ground cumin, chile powder, salt, Worcestershire powder); set aside. Cut each pork butt in half. Rub 1/4 of the rub over the pork butt, covering generously. Store remaining rub in an airtight container and save for another use.
2. Meanwhile, line roasting pan with aluminum foil, leaving enough on the ends to fold up and seal; place pork in the center of the foil. Pour chicken stock and garlic cloves over pork. Bring the edges of the foil together and fold to seal. Cover roasting pan with another piece of foil. Bake at 300 degree F for 5 hours. Cool slightly; shred.