Here it is:
1 pound whole-grain lasagna noodles
Prepare according to package directions.
4 cups chopped spinach
Steam for 2-3 minutes, let excess water drain.
16 ounces tomato sauce
2 cups fresh ricotta
2 cups mozzarella
Spread a thin layer of tomato sauce on the bottom of a large casserole. Cover surface with a layer of noodles, 1/2 of the ricotta, 1/2 of the spinach, 1/3 of the remaining sauce, and 1/3 of the mozzarella. Lay down another layer of noodles, the rest of the ricotta, the rest of the spinach, 1/3 of the sauce, and 1/3 of the mozzarella. Spread a final layer of noodles, the remainder of the sauce and mozzarella; bake uncovered at 350 for 40 minutes.
Source: Animal, Vegetable, Miracle