Hearty Roast Beef Po Boy

Name: Hearty Roast Beef Po Boy
Prep time: 15 min
Cook time: 3 h
Total time: 3 h 15 min
Cuisine: American
Ingredients: 4 Pounds Beef Chuck Roast; 1 teaspoon Salt; 1 teaspoon Black Pepper; 2 teaspoons Vegetable Oil; 1 Each Yellow Onion (Peeled and sliced); 4 Cloves Garlic (minced); 2 Tablespoons All Purpose Flour; 2-1/2 Cups Beef Broth; 1/2 teaspoon Dried Thyme; 2 teaspoons Worcestershire Sauce; 1/4 Cup Unsalted Butter; 6 Each Po'Boy Bread; 6 Slices Provolone Cheese; 1/2 Cup Mayonnaise; 2 Each Fresh Tomatoes (sliced (optional)); 3 Each Dill Pickles (sliced (optional)); 1 Cup Shredded Lettuce ((optional))