Slow Cooker Cheese Steaks

Details

Ingredients

• 2 pounds beef tri tip steak
• 1 cup beef stock
• 1 tablespoon red wine vinegar
• 1 tablespoon Worcestershire sauce
• 2 teaspoons olive oil
• 1 large onion, sliced
• 1 large green pepper, sliced
• 8 ounces sliced fresh mushrooms
• 12 slices white American cheese
• 6 French or Italian sandwich rolls, split