butternut squash and kale lasagna with sage bechamel for winter

The first time I made this lasagna, it was the kind of January evening when the wind howls like it’s auditioning for a horror movie and the dog refuses to go outside. My market box had delivered a knobby butternut squash the size of a bowling ball and a bouquet of lacinato kale so pretty it felt criminal to cook it. I wanted—no, needed—something that would taste like a cashmere blanket feels: warm, luxurious, and just a little bit fancy. Four cheese pulls and one empty casserole dish later, my husband declared this “the lasagna that ruined all other lasagnas.” Now we make it every time the first real snow sticks, and the smell of sage sizzling in butter drifting through the house has become our official seasonal soundtrack.

Ingredient Breakdown

Great lasagna is a symphony, not a solo. Let’s meet every section of the orchestra:

Butternut Squash: Look for one with a long, straight neck—easier to peel and slice into thin planks that roast in 20 minutes. If you’re in a hurry, grab the pre-peeled cubes from the produce section, but toss them with a drizzle of maple to mimic the caramel you’d get from fresh roasting.

Lacinato Kale: Also called dinosaur kale, it’s flatter and more tender than curly kale, so it wilts quickly without that swampy flavor. Strip the ribs, stack the leaves like dollar bills, and chiffonade into ribbons.

Sage: Fresh is non-negotiable. Dried sage tastes like dusty potpourri. Fry the leaves until they whisper—this seasons the butter that becomes your béchamel base.

Fontina: From the Italian Alps, it melts into a silky puddle. If you can only find Danish fontina, that’s fine, but avoid the pre-shredded stuff which contains anti-caking starches that break your sauce.

Gruyère: Adds nutty depth. In a pinch, Swiss works, but you’ll miss the alpine complexity.

Parmesan: Buy the real Parmigiano-Reggiano and grate it on the small holes of a box grater so it dissolves into the béchamel without turning grainy.

Milk & Butter: Whole milk gives the sauce body; butter with 2% milk is fine, but skip skim—your lasagna will taste like diet food and nobody wants that kind of negativity in winter.

Lasagna Noodles: Regular, not no-boil. The trick is to soak them in very hot tap water while you prep everything else; they’ll finish cooking in the oven and drink up the sauce.

Step-by-Step Instructions

1. 1

   Roast the Squash

   Preheat oven to 425 °F (220 °C). Peel the squash, halve it, and scoop out seeds. Slice into ¼-inch planks—think playing cards, not poker chips. Toss with 2 Tbsp olive oil, 1 tsp kosher salt, ½ tsp pepper, and a pinch of nutmeg. Arrange on parchment-lined sheets so pieces don’t overlap. Roast 18–20 min, flipping once, until edges blister and smell like caramel corn. Let cool; reduce oven to 375 °F (190 °C).

2. 2

   Soak the Noodles

   While squash roasts, lay regular lasagna noodles in a 9×13 pan and cover with the hottest tap water you can. Add 1 tsp salt to season them from the inside out. Let soak 20 min; they’ll be pliable but still have a bite.
3. 3

   Wilt the Kale

   Heat 1 Tbsp olive oil in a Dutch oven over medium. Add 3 minced garlic cloves and chili flakes; cook 30 sec until fragrant. Pile in 8 cups chopped kale (it looks like a mountain, but wilts to a molehill). Splash in ¼ cup vegetable broth, cover, and steam 3 min. Season with ½ tsp salt and a squeeze of lemon to keep the color vivid. Drain in a sieve, pressing out excess liquid so your lasagna doesn’t swim.

4. 4

   Brown-Butter Sage Béchamel

   Melt ½ cup (1 stick) unsalted butter in a heavy saucepan over medium. Add 12 fresh sage leaves; fry 2 min until edges curl and butter smells nutty. Whisk in ½ cup flour; cook 2 min to a blond roux. Slowly pour in 4 cups warm whole milk, whisking like you’re beating egg whites for a soufflé—no lumps allowed. Simmer 5 min until it coats the back of a spoon. Off heat, stir in ½ cup grated Parmesan, ½ tsp white pepper, and pinch of fresh nutmeg. Taste; it should make you close your eyes.
5. 5

   Cheese Filling

   In a bowl, combine 15 oz ricotta, 1 egg, 1 cup shredded fontina, ½ tsp salt, and zest of ½ lemon. The lemon is the secret handshake—it brightens all that richness.

6. 6

   Assembly

   In a 9×13 ceramic or metal pan (metal crisps edges better), ladle ¾ cup béchamel on the bottom. Lay 3 noodles lengthwise. Spread ⅓ of ricotta mixture, top with half the squash, ⅓ remaining fontina, and drizzle ¾ cup béchamel. Repeat noodles, ricotta, kale layer, fontina, béchamel. Final layer: noodles, all remaining béchamel, 1 cup Gruyère, and ¼ cup Parmesan. Tear the crisp sage leaves from step 4 and scatter on top—they become earthy chips.

7. 7