INGREDIENTS

* 1 pound peeled and seeded pumpkin, cut into pieces
* 1 tablespoon butter, softened
* 1 teaspoon ground cinnamon
* sea salt and ground black pepper to taste
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* 2 tablespoons butter
* 2 tablespoons all-purpose flour
* 1 cup milk
* 2 bay leaves
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* 1 tablespoon olive oil
* 1 onion, thinly sliced
* 1 fennel bulb, thinly sliced
* 4 cloves garlic, minced
* 1 (10 ounce) bag baby spinach
* 1 (16 ounce) container low-fat ricotta cheese
* 1 1/2 teaspoons ground nutmeg
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* 1 tablespoon olive oil
* 1/2 pound lean ground beef
* 2 tablespoons tomato paste
* 1 (14.25 ounce) can tomato puree
* 12 dry lasagna noodles
* 1/3 cup freshly grated Parmesan

DIRECTIONS

1. Fill a saucepan with 1/2 inch of water, then add pumpkin pieces. Bring to a boil over high heat, then reduce heat to medium-low, cover, and steam until the pumpkin is very tender, 10 to 15 minutes. Drain pumpkin, then mash with 1 tablespoon butter, cinnamon; salt and pepper to taste, then set aside.
2. Melt 2 tablespoons butter in a saucepan over medium heat. Whisk in flour and cook, stirring constantly, until the paste just begins to turn golden, about 2 minutes. Whisk in milk gradually so that no lumps form. Bring to a gentle boil. Add the bay leaves, and reduce heat to low or warm. Allow to gently cook for 10 to 15 minutes, stirring frequently, then remove from heat.
3. Heat 1 tablespoon olive oil in a large skillet over medium heat. Stir in onion, fennel, and garlic; cook until the onion has softened and turned translucent, about 5 minutes. Add spinach and cook until wilted. Scrape mixture into a large bowl, and mix well with ricotta cheese and nutmeg.
4. Using the same skillet, heat another 1 tablespoon olive oil over high heat. Brown ground beef in oil, mixing thoroughly to break into small pieces. Once browned, reduce heat to medium-low and pour off excess grease. Stir in tomato paste and tomato puree. Gently simmer until thickened, about 10 minutes.
5. Preheat oven to 400 degrees F (200 degrees C). Grease a 9×13 inch lasagna dish.
6. Line the bottom of the lasagna dish with 4 noodles, do not overlap. Spread the ricotta mixture evenly over noodles, then sprinkle with 1/3 of the Parmesan cheese. Place another 4 noodles on top of the ricotta, then spread with evenly with the mashed pumpkin. Place the remaining 4 noodles on top of the pumpkin and top with the tomato sauce; sprinkle with another 1/3 of the Parmesan cheese. Stir the white sauce until smooth, then discard the bay leaves; pour the sauce over top of the lasagna. Sprinkle with remaining Parmesan cheese.
7. Place lasagna dish onto a foil-lined baking sheet (to catch any spills). Bake in preheated oven until the noodles have softened, and the white sauce has turned bubbly and golden brown, about 30 minutes.