To your beef add petite diced tomatoes, worcestershire sauce, ketchup, and mustard. Mix well then add in 1 cup of your shredded cheddar cheese. Season with salt and pepper to taste.
Whisk tomato sauce, water, and worcestershire sauce. Add this to the bottom of your casserole dish.
Spoon hamburger mixture into shells and place them into your casserole dish. Top with remaining cheese add more cheese on top as desired. Bake for 15-20 minutes.
Serve and enjoy!