For the best results, use a mandolin to slice the zucchini thinly and evenly. Don't skip the step of draining the zucchini; this will help prevent a soggy scarpaccia. Feel free to experiment with different herbs and cheeses to customize the flavor to your liking. A sprinkle of red pepper flakes adds a nice touch of heat. The scarpaccia is best enjoyed fresh, but leftovers can be stored in the refrigerator and reheated.