Ingredients:
1 teaspoon vegetable oil
1 (4 pound) pork shoulder roast
1 cup barbeque sauce
1/2 cup apple cider vinegar
1/2 cup chicken broth
1/4 cup light brown sugar
1 tablespoon prepared yellow mustard
1 tablespoon Worcestershire sauce
1 tablespoon chili powder
1 extra large onion, chopped
2 large cloves garlic, crushed
1 1/2 teaspoons dried thyme
8 hamburger buns, split