"This top-rated tart is so easy to make and great for company...."
INGREDIENTS
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4 medium leeks
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3 thick hickory-smoked bacon slices
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1 cup (4 oz.) shredded Gruyère cheese, divided*
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2 teaspoons chopped fresh thyme**
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1/2 teaspoon pepper
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1/2 teaspoon salt
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1/2 (17.3-oz.) package frozen puff pastry sheets, thawed
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1 egg white