how long to cook a pork butt roast
1 Place the roast in the oven and immediately reduce the temperature down to 200 degrees F. 2  Roast for about 4 hours or until the meat is falling-apart tender (cooking time will vary depending on the size of the roast). 3  Stir the salt and black pepper into the juice (do not omit the salt!).4  Slice meat as desired. Place the roast in a greased casserole dish with a lid. 2  Sprinkle the roast on all sides with Worcestershire sauce. 3  Let sit at room temperature for 1-1/2 hours. 4  After 1-1/2 hours spoon any Worcestershire sauce (if any) back on the roast that has accumulated on the bottom of the casserole.