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fall lasagna with kabocha squash bechamel, mushrooms, and radicchio on a plate with a fork
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4.80 from 5 votes

Fall Lasagna with Kabocha Squash Béchamel

This vibrant fall lasagna with kabocha squash béchamel, mushrooms, and radicchio makes a stunning vegetarian main dish for Thanksgiving and beyond.
Prep Time30 minutes
Cook Time2 hours 5 minutes
Total Time2 hours 35 minutes
Course: Vegetarian Bakes
Cuisine: American
Keyword: fall lasagna, kabocha squash lasagna, squash lasagna
Calories: 308kcal
Author: Carolyn Gratzer Cope

Ingredients

For the squash puree

  • 1 medium kabocha squash 3 to 4 pounds
  • 2 cups (475 ml) good vegetable broth

For the béchamel

  • 4 tablespoons (56 grams) butter
  • 1 tablespoon minced fresh sage leaves
  • 1 tablespoon minced fresh thyme leaves
  • ¼ cup (30 grams) all-purpose flour
  • 4 cups (950 ml) whole milk
  • 1 ½ teaspoons fine sea salt
  • ¼ teaspoon ground nutmeg
  • ¼ teaspoon freshly ground black pepper
  • ⅛ teaspoon ground cayenne

For the vegetable filling

  • 1 tablespoon (15 ml) olive oil
  • 1 medium onion diced small
  • 8 ounces (227 grams) sliced mushrooms
  • 3 cloves garlic minced
  • ½ teaspoon fine sea salt
  • 1 medium head radicchio cored, quartered, and cut into thin shreds
  • 1 tablespoon (15 ml) balsamic vinegar

To assemble the lasagna

  • 9 ounces (255 grams) no-boil lasagna noodles
  • 1 pound (454 grams) fresh mozzarella, thinly sliced
  • 1 pound (454 grams) fresh ricotta
  • 1 cup (80 grams) freshly grated parmesan or pecorino cheese

Instructions

Make the squash puree

  • This process should yield somewhere in the neighborhood of 4 cups of squash puree, but don’t stress about it.
  • Preheat oven to 400°F with a rack in the center.
  • Pierce the squash in several places with a small, sharp knife and place in a roasting pan.
  • Bake for about an hour, until flesh is tender enough to insert a fork easily.
  • When cool enough to handle, cut in half. Scoop out and discard seeds and stringy center.
  • Scoop the flesh out of the skin and into the bowl of a food processor fitted with the blade, or a high-speed blender.
  • Add broth and puree until perfectly smooth, stopping to scrape down sides as necessary.

Make the béchamel

  • In a medium pot with a heavy bottom, melt the butter over medium-high heat.
  • Add the thyme and sage and cook for one minute.
  • Whisk in flour and cook for another minute or so, until bubbling substantially.
  • Whisk in milk all at once.
  • Add the salt, nutmeg, pepper, and cayenne.
  • Bring to a boil over high heat, then reduce heat and simmer, stirring frequently, for five minutes or so, until slightly thickened.
  • Off the heat, stir in the squash puree until it all becomes a smooth sauce.

Make the filling

  • Warm the olive oil in a 12-inch nonstick skillet over medium heat.
  • Add onion, mushrooms, garlic, and salt.
  • Cook, stirring occasionally, until mushrooms have reduced in volume by about half, and any moisture they've released has simmered away.
  • Add radicchio and cook, stirring frequently, until wilted.
  • Off the heat, stir in the balsamic vinegar.

Assemble and bake the lasagna

  • Lightly grease an extra-deep 9x13-inch roasting pan.
  • Place a thin layer of béchamel sauce at the bottom of the pan, followed by a layer of lasagna noodles.
  • Top with half the mozzarella, half the ricotta, half the mushroom mixture, ⅓ of remaining béchamel, and ¼ of the parmesan.
  • Repeat with another layer of noodles, mozzarella, ricotta, mushroom mixture, sauce, and parmesan.
  • Finally, add one more layer of noodles and top with remaining sauce and parmesan.
  • Place roasting pan on top of a rimmed baking sheet to catch any drips.
  • Bake for 35-40 minutes, until lightly browned and bubbly.
  • Let cool for at least 10 minutes before serving. Lasagna will set up and be easier to slice as it cools.

Notes

  1. Kabocha (sometimes called Japanese pumpkin) is my favorite winter squash. Its flesh is dense and sweet, with a lower water content than butternut. If you can't find it, you could substitute sugar pumpkin or red kuri squash in this recipe without making further changes. Or substitute butternut or even acorn squash and reduce the amount of broth. (Use just enough broth to make the squash easy to puree.)
  2. My favorite boxed vegetable broth by far is Imagine No Chicken lower-sodium broth. It has a great flavor profile and none of the rust-colored nonsense that plagues many other brands.
  3. Whole milk provides just the right amount of richness.
  4. Use a really good-quality butter if you can. Here and virtually everywhere, I start with a cultured, salted butter from grass-fed cows. This sounds fancy but doesn't have to be. Kerrygold, for example, is sold in most supermarkets at a reasonable price.
  5. A combination of fresh sage and thyme gently amplifies the autumnal vibe of this dish.
  6. Here I've pictured shiitake mushrooms, which have a deeply savory flavor and minimal moisture content. You can use any mushroom variety that you like in this recipe, or a combination. Over the years I've also used white button mushrooms, creminis, and portobellos with the gills scraped out. They all work well, as long as you cook off any liquid before adding the radicchio.
  7. Radicchio — a member of the chicory family — makes a fabulous fall and winter ingredient. It's earthy and bitter in varying degrees depending on the variety. Look for a crisp, tight head with minimal browning.
  8. A little bit of balsamic vinegar stirred into the filling takes the edge off radicchio's bitterness and ties all the flavors together beautifully. You can use a standard grocery store grade and save the fancy stuff for other recipes.
  9. No-boil lasagna noodles do a great job and are super-convenient. If you want to up your game, can use any lasagna noodles you like, all the way up the food chain to fresh homemade pasta.
  10. I prefer whole-milk ricotta and mozzarella, but you can use part-skim if you like. Note that the earlier version of this recipe did not include ricotta, but I've decided to add it over time. You can leave it out if you prefer — it's great either way.
  11. You can make this recipe with either parmesan or pecorino, or a combination. Pecorino (made with sheep's milk) is a little bit saltier and tangier, while parmesan is a bit sweeter. Either way, choose a good-quality, freshly grated version. If it's important to you that this dish be vegetarian, be sure to use a variety that's made without animal rennet.
  12. You can fully prepare this lasagna up to a day or two in advance, cover tightly, and store in the fridge, then bake shortly before serving. Or you can even bake it ahead of time and pop it into the oven for a short time to reheat it to serving temperature.
  13. Leftovers will keep in an airtight container in the fridge for a week. Truth be told, I often reheat them in the microwave.

Nutrition

Calories: 308kcal | Carbohydrates: 32.2g | Protein: 21.4g | Fat: 10.4g | Fiber: 4g