The lasagna can be prepared and refrigerated up to 24 hours ahead of time. Assemble the lasagna through step 6. Cover with foil and refrigerate. Bake as directed in step 7 except bake 45 minutes before removing the foil.
Precooked or oven-ready lasagna noodles are available with the other dried pastas in the supermarket.
Rub the zucchini across the largest holes of the grater.
Assemble the lasagna, layer by layer.