When making a zucchini stir-fry, it’s important not to cut the zucchini too thin. Otherwise, it can become limp and soggy in the time the dish takes to cook. Somewhere between ¼-½ inches is perfect. Our preferred slices include: 1. Slicing off the top and bottom. 2. Lying it on its side and slicing it down the middle lengthwise. 3. Slicing each of those halves into ¼-½ inch half-moon slices.