For steaks: 1 pound ground round 1/4 cup onion, chopped 1/4 cup green bell pepper, chopped 1 Tablespoon Worcestershire sauce 1 teaspoon salt 1/2 teaspoon fresh ground pepper
For sauce: 2 cups mushrooms, sliced 1/2 cup onion, chopped 1 clove garlic, minced 3 Tablespoons butter 1/8 teaspoon salt 1/8 teaspoon pepper 1/8 teaspoon celery salt
Mix all ingredients for steaks together in a large bowl. Shape into 4 large patties. Heat a large skillet over medium-high heat. Add patties and brown well on both sides. Transfer to a warm plate, cover and keep warm. Heat skillet to medium heat and scrape up any browned bits. Add mushrooms, onion, garlic and butter and cook for about 5 minutes. Sprinkle with salt, pepper and celery salt. Spoon sauce over steaks, serve immediately.