INGREDIENTS
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1 beef tenderloin (2 to 2 1/2 pounds)
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Ground black pepper (optional)
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1 egg
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1 tbsp. water
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1 tbsp. butter
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2 cups finely chopped mushrooms
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1 medium onion, finely chopped (about 1/2 cup)
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All-purpose flour
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1/2 of a 17.3-ounce package Pepperidge Farm® Puff Pastry Sheets (1 sheet), thawed