Shredded Barbecued Beef
["1 boneless beef chuck roast (about 4 lb.)", "3 Tbsp. vegetable oil, divided", "2 large onions, chopped", "1 c. ketchup", "1 c. beef broth", "2/3 c. chili sauce", "1/4 c. cider vinegar", "1/4 c. packed brown sugar", "3 Tbsp. Worcestershire sauce", "2 Tbsp. prepared mustard", "2 Tbsp. molasses", "2 Tbsp. lemon juice", "1 tsp. salt", "1/4 tsp. cayenne pepper", "1/8 tsp. pepper", "1 Tbsp. liquid smoke (optional)", "12 to 16 kaiser rolls or hamburger buns"]
["In a Dutch oven, brown roast on all sides in 1 tablespoon of oil."]
["chuck roast", "vegetable oil", "onions", "ketchup", "beef broth", "chili sauce", "cider vinegar", "brown sugar", "Worcestershire sauce", "mustard", "molasses", "lemon juice", "salt", "cayenne pepper", "pepper", "liquid smoke", "kaiser rolls"]