1 pound ground beef
1/3 cup dry bread crumbs
1/2 teaspoon salt
1/4 teaspoon freshly-ground black pepper
1 egg
1 large onion
separated into rings
1 can condensed beef broth - (10 1/2 oz)
8 ounces mushrooms
2 tablespoons cold water
2 teaspoons cornstarch
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