Name: Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: Italian-inspired
Ingredients: 400 g / 14 oz peeled butternut squash or firm pumpkin; 2 tsp olive oil (for squash); Salt and black pepper, to taste; 1 large red onion, peeled and thickly sliced; 4 tsp olive oil (for onion); 1-2 tsp sugar, adjust to taste; 2 tbsp balsamic vinegar; 3 lacinato kale leaves, destemmed and finely shredded; 1 large garlic clove, finely diced; 2 tbsp nutritional yeast; 200 g / 7 oz penne pasta (GF if needed), wholewheat used here; 4 tsp olive oil (for garlic sauce); A good pinch of chilli flakes (optional, fine Korean chilli flakes used); Chopped toasted hazelnuts, to serve

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If you’re looking to elevate your weeknight dinners with a vibrant and deeply comforting dish, this Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe is just what you need. It combines the natural sweetness of roasted butternut squash and buttery caramelized onions with the earthy brightness of kale and a delightful crunch from toasted hazelnuts. Every bite bursts with layers of flavor and textures that feel indulgent yet wholesome. Trust me, this pasta is going to become your new favorite fall-inspired comfort food that’s both satisfying and surprisingly simple to make.

Ingredients You’ll Need

The image shows a metal baking sheet with two types of food cooked side by side: on the left are many small bright orange chunks of roasted butternut squash with some caramelized edges, and on the right is a pile of dark purple caramelized onion slices with a shiny, slightly sticky texture that spreads in an uneven layer. The baking sheet has many brown toasted marks and bits, showing heavy use. The background is a white marbled texture. photo taken with an iphone --ar 4:5 --v 7

This Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe calls for a handful of ingredients that are simple but essential. Each one brings its own unique contribution, from the silky roasted squash adding a natural sweetness, to aromatic garlic, and the crunchy hazelnuts that provide a fantastic contrast in texture.

400 g peeled butternut squash or firm pumpkin: The star of the dish, offering sweetness and creaminess when roasted.
Olive oil: For roasting and sautéing, it adds smooth richness and helps bring all the flavors together.
Salt and black pepper: Key to seasoning and enhancing every component perfectly.
1 large red onion, peeled and thickly sliced: When caramelized, it adds a luscious, sweet depth alongside the squash.
1-2 tsp sugar: Balances the onion’s acidity and intensifies caramelization.
2 tbsp balsamic vinegar: Adds tangy richness and a beautiful glaze to the onions.
3 lacinato kale leaves, destemmed and finely shredded: This hearty green adds vibrant color and a gentle bitterness to balance the sweetness.
1 large garlic clove, finely diced: Infuses the sauce with fragrant warmth without overpowering.
2 tbsp nutritional yeast: Provides a nutty, cheesy flavor that’s perfect for a plant-based uplift.
200 g penne pasta (GF if needed): Whole wheat or your favorite type meshes wonderfully with the bold flavors.
A good pinch of chili flakes (optional): Adds a subtle kick for those who love a bit of heat.
Chopped toasted hazelnuts: The final crunchy finish that takes this dish to the next level.

How to Make Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe

Step 1: Roast the Squash and Onion

Start by heating your oven to 200° C. Dice the peeled butternut squash into uniform cubes, toss them with olive oil and a pinch of salt, and spread them out on a large baking tray. Next, coat your sliced red onions with olive oil and place them on the same tray but keep the onion slices overlapping—this helps them stay moist and become sweetly tender. Roast everything for 30 minutes, stirring halfway so the squash gets beautifully charred and the onions start to caramelize.

Step 2: Finish Caramelizing the Onions

Once the squash is roasted to perfection, remove it from the tray. Then sprinkle the cooked onions generously with salt and sugar, drizzle with balsamic vinegar, and return them to the oven. Let them cook for another 10 to 15 minutes, stirring halfway to ensure they develop that glossy, deeply flavored caramelized texture that makes your pasta irresistible.

Step 3: Cook the Pasta and Kale Together

While the onions finish roasting, boil your penne pasta in plenty of salted water until just before al dente. About 1.5 minutes before the pasta is done, save a little pasta water, then toss in the shredded kale and let it cook with the pasta for the last minute. This is a clever way to soften the kale but keep it vibrant and slightly crisp.

Step 4: Prepare the Garlic Sauce

Gently heat olive oil in a pan on a very low flame and add the diced garlic. Cook slowly while stirring frequently, making sure it softens and releases its fragrance without browning—that would make it bitter. Next, stir in the nutritional yeast, a pinch of salt, and a couple of tablespoons of the reserved pasta water, creating a light, silky emulsion that’ll cling beautifully to your pasta.

Step 5: Combine Everything

Drain the pasta and kale mixture and toss it directly into your pan with the garlic sauce. Stir well to coat every piece. Then fold in the tender roasted squash and caramelized onions, adjusting salt and pepper as needed. The dish will come together in a perfect harmony of flavors and textures, ready to be plated.

Step 6: Add the Finishing Touches

Divide the pasta between your serving dishes and sprinkle with a touch of chili flakes if you like some heat, plus plenty of chopped toasted hazelnuts. The hazelnuts provide a wonderful crunch and a toasty note that makes every bite exciting.

How to Serve Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe

A white speckled bowl holds a mix of penne pasta, dark green kale leaves, and bright orange roasted squash pieces. Scattered among these are shiny, reddish-brown caramelized onions and sprinkled chopped nuts on top, adding texture and contrast. A silver fork rests inside the bowl on the right side, sharing space with the pasta. Nearby, there is a smaller white bowl filled with whole and chopped nuts. The surface under the bowls is white marble with subtle gray veining. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

To take this dish even further, consider adding a sprinkle of fresh herbs like parsley or a few shavings of vegan parmesan for extra flair. A drizzle of high-quality olive oil just before serving adds a lush finish. These simple garnishes complement the flavors perfectly and elevate the presentation.

Side Dishes

This pasta is so filling and flavorful it can definitely shine on its own. But if you want to serve sides, a crisp green salad with a lemon vinaigrette works beautifully to brighten the meal. Alternatively, some crusty bread or garlic bread is perfect for mopping up any delicious sauce left behind.

Creative Ways to Present

If you’re entertaining, serve this pasta family-style in a large warm bowl with extra hazelnuts and kale scattered on top so everyone can help themselves. For a more elegant touch, twirl the pasta onto individual plates using tongs to create neat nests, then garnish each with a few chili flakes and hazelnuts for a restaurant-quality experience at home.

Make Ahead and Storage

Storing Leftovers

This pasta keeps well in the fridge for up to three days when stored in an airtight container. Keeping the hazelnuts separate and adding them fresh when serving helps maintain their crunch.

Freezing

While you can freeze this dish, note that kale and cooked pasta may lose some of their texture. If freezing, place portions in airtight freezer-safe containers and consume within one month for the best quality.

Reheating

When reheating, warm the pasta gently on the stovetop with a splash of water or olive oil to revive the sauce and prevent it from drying out. Avoid microwaving at high heat to keep the flavors fresh and the textures pleasant.

FAQs

Can I use a different type of squash in this pasta?

Absolutely! Butternut squash is ideal for its sweetness and texture, but sugar pumpkin or even kabocha work wonderfully as well, each bringing their own unique flavor nuances.

Is nutritional yeast necessary in this recipe?

While nutritional yeast adds a lovely cheesy and nutty undertone, you can omit it or substitute with grated parmesan if not vegan. It helps deepen the sauce flavor but isn’t compulsory.

Can I make this recipe gluten-free?

Definitely. Just swap the penne for a gluten-free pasta variety you trust. The cooking times might vary slightly, so keep an eye on it to avoid overcooking.

What if I don’t have hazelnuts? Is there a substitute?

You can use toasted walnuts, pecans, or almonds as alternatives. Each brings a different type of crunch and flavor, so feel free to experiment based on what you have on hand.

How do I know when the caramelized onions are ready?

You’re looking for a deep amber color with a glossy, jammy texture. They should be sweet and tender without any burnt bits. The balsamic vinegar gives them a beautiful shine and tang that balances all the sweetness.

Final Thoughts

Trust me when I say this Squash and Caramelized Onion Pasta with Kale and Hazelnuts Recipe will quickly become one of your go-to recipes for cozy dinners that taste like a special occasion. The way the ingredients come together is magic on a plate—rich, textured, and bursting with layered flavors. So pull out your baking tray and give this beauty a whirl. Your taste buds will thank you!