Step 1

In a large saucepan (I like using my big 5 qt dutch oven just to have a lot of room.) melt the 4 tablespoons of butter. Add the garlic and onions and sauté until golden. Add the spinach and stir for a few minutes to marry all the flavors. Turn off heat and set aside.

Step 2

In the bowl of a food processor fitted with a steel blade, add half the ricotta, the eggs, parmesan cheese, nutmeg and salt & pepper. Process for a few minutes until blended and smooth. Transfer to a large bowl. (don't wipe the food processor bowl out.)

Step 3

To the food processor add the spinach/garlic mixture and pulse until finely chopped. Add to the bowl with the ricotta mixture as well as the rest of the ricotta cheese. Stir until blended and smooth.

Step 4

In a large saucepan (I like to wipe out the dutch oven a bit and use that again,) melt the 5 tablespoons of butter and then add the flour- whisking constantly until golden. Add the milk gradually, about a cup at a time, stirring well between each addition. When thick and bubbly, add 3/4 of the mozzarella and 3/4 of the gruyere. Add salt and pepper to taste.

Step 5

In a 9x13 lasagna pan, start by spreading a small amount of the white sauce onto the bottom of the pan. Top with a layer of noodles (I used 4 across for each layer,) Spread 1/3 of the spinach mixture on top of the noodles, followed by 1/4 of the sauce. Repeat 3 more times, noodles- spinach- sauce. Topping with a 4th layer of noodles, the last 1/4 of sauce and the remaining cheese.

Step 6

Cover tightly with foil, and bake at 400F for 20 minutes. Remove the foil and bake for another 20 minutes or until the cheese is golden and bubbly.