Yields 4 servings 8 Basic Crêpes (see recipe below) 2 tablespoons (1 ounce) unsalted butter 8 large eggs 2 tablespoons whole milk 1 teaspoon freshly grated lemon zest Kosher salt and freshly ground black pepper 4 ounces Gruyere cheese 8 ounces thinly sliced smoked salmon Prepare the crêpes. Preheat the…