Slow Cooker Cheese Steak Subs

These are so good, your family will be asking for this at least once a week.

Ingredients:
3 1/2 lbs. tri tip steak
1 1/2 cups beef broth
2 Tbs. red wine vinegar
2 Tbs. Worcestershire Sauce
1 clove garlic, crushed
1 1/2 tsp. freshly ground black pepper
1 1/2 tsp. onion salt
2 Tbs. olive oil
2 large onions, sliced
1 large green bell pepper, sliced
1 large red bell pepper, sliced
1 tsp. salt
20 Slices American cheese
10 Italian sub rolls, split

Preparation:
Place the beef in the slow cooker insert. In a medium bowl, whisk together the beef broth, vinegar, worcestershire sauce, crushed garlic, black pepper and onion salt. Pour this mixture over the beef and cook on low for 3-4 hours. Remove the cooked beef from the broth and set aside. Reserve the broth. Preheat the oven to 350 degrees Fahrenheit. Heat the olive oil in a large skillet over medium heat. Add the onions, peppers and salt and cook until the vegetables are soft. About 5 minutes. Slice the beef thinly and divide the beef and vegetables evenly among the sub rolls. Top each sandwich with 2 slices of American cheese; wrap in foil. Place sandwiches in preheated oven and heat until the cheese is melted; about 8-10 minutes. Serve hot sandwiches with reserved broth, if desired.