INGREDIENTS
•
1 17.3-ounce package frozen puff pastry (2 sheets), thawed
•
1/4 cup (1/2 stick) unsalted butter
•
12 ounces fresh shiitake mushrooms, stemmed, caps cut into 1/4-inch-wide strips
•
1 teaspoon coarse kosher salt, divided
•
1/2 teaspoon coarsely ground black pepper, divided
•
1 pound slender asparagus spears, 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 crème fraîche*
•
1/2 cup (packed) coarsely grated Gruyère cheese (about 2 ounces)
•
Fresh thyme sprigs (for garnish)