To dice zucchini, cut off each end of zucchini and cut lengthwise in about 1/2 inch slices. Stack 2 or 3 slices on top of each other and slice again lengthwise about 1/2 inch wide. Now turn the zucchini so you can cut across again about 1/2 inch apart. This will give you 1/2 inch cubes. If you want a smaller cube simply make all your cuts about 1/4 inch instead.