Step 1

In a large bowl, combine beef, chopped onion, bread crumbs, salt, and pepper; stir well. Shape mixture into 4 patties.

Step 2

In a large skillet over medium heat, cook patties 5 minutes on each side. Remove patties from skillet, reserving 1 tablespoon drippings in skillet. Set patties aside.

Step 3

Over medium-high heat, cook mushrooms and sliced onion in drippings 5 minutes, or until tender, stirring constantly.  Add broth and Worcestershire sauce to skillet. Return patties to skillet; bring to a boil. Cover, reduce heat, and simmer 15 minutes. Remove patties from skillet with a slotted spoon; place on a platter and keep warm.

Step 4

In a small bowl, combine water and cornstarch; stir well. Add to broth mixture and bring to a boil; cook 1 minute or until thickened, stirring constantly. Spoon over patties and serve.