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Ingredients

• 1 17.3-ounce package frozen puff pastry (2 sheets), thawed
• 1/4 cup unsalted butter
• 12 ounces white button mushrooms, halved and then sliced thinly
• 1 teaspoon coarse kosher salt, divided
• 1/2 teaspoon coarsely ground black pepper, divided
• 1 pound fresh asparagus, trimmed, cut on diagonal into 1-inch pieces
• 1 1/2 teaspoons chopped fresh thyme
• 1 1/2 teaspoons finely grated lemon peel
• 1/2 cup crme frache
• 1/2 cup (packed) coarsely grated Gruyere cheese (about two ounces)
• Fresh thyme sprigs (optional)

Description

Serious Eats