while the pork butt is braising, prepare the BBQ-hoisin sauce; mix 1/3 cup hoisin sauce, 1/3 cup soy sauce, 1/3 cup ketchup, 1 tblsp chili sauce, 1 tblsp honey, 1 tsp five spice pwd, 1 tsp mustard pwd, 1 tsp garlic paste, 1/2 tsp grated ginger, 1/2 tsp toasted sesame oil