INGREDIENTS
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1 1/2 pounds ground beef
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2 scallions, finely chopped
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1/4 cup seasoned bread crumbs
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1 egg
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1 tablespoon prepared yellow mustard
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1/2 teaspoon salt
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1/4 teaspoon black pepper
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1 (12-ounce) jar beef gravy
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1/2 cup water
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2 teaspoons prepared horseradish
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1/2 pound fresh mushrooms, sliced