Zucchini is about 94% water, so it's important to follow the steps below to minimize the amount of water in your zucchini lasagna. Note that none of these options removes all of the water but it is greatly reduced. (1) Cut the zucchini into 1/4" thick slices (or even thinner by using a mandoline). (2) For best results, cook the zucchini slices prior to adding them in the lasagna. Grill the zucchini over medium high heat for 2-3 minutes per side until tender, or bake at 450 degrees for 2-3 minutes per side. The grill method removes the most water. (3) After cooking or before adding to the lasagna, blot the zucchini dry with paper towels to remove excess water. (4) If you prefer not to cook your zucchini, salt each side and place the zucchini in a colander to drain for about 10 minutes. Blot dry and add to the lasagna.