Leek, Lemon, and Feta Quiche

INGREDIENTS

• 1 sheet frozen puff pastry
• 2 tablespoons extra-virgin olive oil
• 1 cup half-and-half
• 1 pound leeks
• 2-1/2 ounces feta cheese, cut into 4 (approx 1/2-inch) slices
• freshly ground black pepper
• 1 teaspoon kosher salt
• 2 teaspoons ouzo (optional)
• 3 eggs
• 1 teaspoon freshly grated lemon zest