INGREDIENTS
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2 tablespoons butter
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1 1/4 cups mushrooms, thinly sliced
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1 onion, thinly sliced
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1 (10 1/2 ounce) can condensed beef broth
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1 1/2 lbs ground beef
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1/2 cup Panko bread crumbs
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1 egg
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1/4 teaspoon black pepper
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1 tablespoon all-purpose flour
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1/4 cup ketchup
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2 teaspoons Worcestershire sauce
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1/2 teaspoon mustard powder
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1/3 cup water
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