Just had this tonight for the first time. Everything went together beautifully. I've also seen similar recipes with included sautéed pancetta or prosciutto. I'll try diced pancetta next time.
The original is at
https://food52.com/recipes/86745-brown-butter-pasta-with-butternut-squash-walnuts-sage and is double this recipe (and I modifed it slightly):
Brown Butter Pasta With Butternut Squash, Walnuts & Sage1 Tbsp extra-virgin olive oil
½ lb butternut squash, halved lengthwise, peeled and sliced into ¼-inch-thick half moons
¼ tsp freshly grated nutmeg
⅛ to ¼ tsp cayenne, depending on your penchant for spice
Kosher salt, to taste
Freshly ground black pepper, to taste
6 oz linguine pasta
4 Tbsp salted butter
½ cup walnuts, toasted until golden and coarsely chopped
16 to 20 stems fresh sage, leaves plucked from stems
Heat a large fry pan over medium-high heat. When the pan is hot, add the olive oil and lower the heat to medium. Sauté the squash slices in batches, sprinkling about one-quarter of the nutmeg and cayenne and seasoning with salt and pepper. Cook for 3 minutes on the first side, tilting the pan to coat the squash slices in oil, then flip and sprinkle again with the nutmeg and cayenne. Sauté for 3 more minutes or until the squash slices are translucent and caramelized in parts. Transfer to a dish and set aside. Repeat with the remaining squash. Once all slices are cooked, transfer to the same dish.
Bring a large pot of generously salted water to a boil and cook pasta al dente according to package instructions.
While the pasta cooks, melt butter in the pan used to cook the squash. After foaming subsides, swirl occasionally for 5 to 7 minutes or until the butter produces a nutty aroma and deepens to a toasty brown. Add the walnuts and swirl to coat. Add the sage leaves and toss to coat. When the pasta is cooked, use tongs to transfer the noodles to the brown butter mixture and toss to thoroughly coat. Turn the heat off. Add the squash back to the pan and toss together to combine with the pasta.
Divide the pasta evenly into 2 bowls, season with freshly ground black pepper and serve.