Just as grated zucchini makes a decidedly delicious addition to quick breads, it is terrific in cookies, adding its own kind of vegetal sweetness. And if you happen to grow your own, you'll be looking for ways to use up the bounty. This otherwise simple dough is packed with grated lemon zest and ground ginger. Replacing half of the regular wheat flour with cornmeal produces a cookie with a sturdier structure and extra flavor.