Since zucchini has a high water content, we need to express some of the water from it before adding it into the lasagna and baking. To do this, you can sprinkle the vegetables with salt or cook them down to release the juices. In this recipe, we will saute the zucchini for a few minutes per side before layering it into the dish. In addition to this, let the lasagna serve 5-10 minutes before serving, as it will let the juices reabsorb into the dish.