Drip Beef Sandwiches

Name: Drip Beef Sandwiches
Yield: 10-12
Ingredients: 1 4-pound chuck, roast; 1 16-ounce jar Pepperoncini; 2 tbsp Rosemary, fresh; 2 Yellow onions; 2 cups Beef broth; 1 Salt and black pepper; 2 tbsp Canola oil; 10 Buttered deli rolls, toasted; 3 tbsp Butter