If your zucchini are really large, scrape the seeds cavity out of the centre before you grate it so it's not too watery. Spread it all out on layers of paper towel to drain it and dry it off a bit. Then measure out 2 cups.
Nuts can also be added to the cake batter if desired.
The frosting recipe makes a very generous amount of frosting.
This can be turned into a carrot cake by substituting an equal amount of shredded carrots for the zucchini.