INGREDIENTS
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Ingredients
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2 cups sliced fresh mushrooms
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1 medium onion, thinly sliced
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1 tablespoon butter
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1 egg, lightly beaten
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1/3 cup milk
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1/2 cup old-fashioned oats
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1/2 teaspoon salt
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1/4 teaspoon pepper
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1-1/2 pounds ground beef
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SAUCE:
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1/2 cup ketchup
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2 tablespoons brown sugar
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2 teaspoons prepared mustard