Butternut Squash Alfredo with Sage

I tried (and slightly tweaked) this recipe by Isa Chandra Moskowitz this weekend and highly recommend it! It's fantastic for when you're feeling the need for a creamy pasta but don't want the calories of a cream or oil based sauce. You can find the original here:
http://www.theppk.com/2012/10/roasted-butternut-alfredo/

Butternut Squash Alfredo with Sage

-1 pound of your favorite pasta (I used little shells) 

Ingredients for sauce (in blender):
- 1 1/2 cups roasted butternut squash (I roasted a butternut squash cut in half lengthwise then cut again widthwise, after scooping out the seeds, on 425F for about 40 minutes until it was very soft. Then I let it cool and scooped out the flesh. I had 5 1/2 cups total and saved the rest for soup or something else later this week!)
-1/2 cup of cashews (soaked for at least 2 hours)
-1 1/2 cups vegetable broth
-2 tbsp dark and flavorful miso
-3 tbsp nutritional yeast
-1/2 tbsp fresh lemon juice

Ingredients for sauce (in saute pan):
-1 tbsp olive oil
-1 medium red onion, thinly sliced
-3 cloves garlic, minced
-1 tsp dry sage
-1/2 tsp cayenne pepper
-3/4 cup dry white wine
-fresh black pepper, to taste
-1/4 tsp salt, or to taste

Method:
Blend the drained cashews along with the vegetable broth until very, very smooth in a blender of food processor. Make sure it's not grainy. It took me about 2 minutes of high powered blending. Then add the squash, miso, yeast and lemon juice and blend well. You might need to use a spatula to scrape down the sides and re-blend.

Meanwhile, cook the pasta per package directions.

In a large saute pan, heat the olive oil over medium heat, then add the onions and cook until they are slightly carmelized (about 8 minutes). Then add the garlic and stir for about a minute. Then add the sage, cayenne, pepper and salt and stir another minute. Then increase heat to high, pour in the wine, and stir for a few minutes until it comes to a boil and then reduces a little bit. Reduce heat to low, pour in butternut squash mixture, and stir to combine. Once combined and heated through, taste to see whether you need to add salt, pepper or more cayenne (if you like a little more heat). Then pour over your drained pasta and serve!