INGREDIENTS
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1 pound ground beef
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1 small onion, finely chopped
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1/3 cup seasoned bread crumbs
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1 egg
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2 tablespoons chopped fresh parsley
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1 teaspoon prepared horseradish (optional)
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1 teaspoon salt
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2 cups sliced fresh mushrooms
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1 can (10.5-ounces) beef gravy