Special Steak Sauce recipe

1/2 Spanish onion, chopped
2 bacon slices, diced
1 ts. butter
1/2 lb. mushrooms, sliced
1/2 ts. salt
1 can tomato soup
1/8 ts. pepper
1/2 ts. mustard, prepared

In a fry pan, cook onion and bacon in butter until onion is soft and bacon is crisp.
Add mushrooms.
Cover and simmer for 2-3 minutes.
Add salt, pepper, soup and mustard and heat.
This recipe is for steak and hamburger.
Makes about 1-1/2 cups.