First you want to soak the cashews in hot water for 30 minutes. Set aside.
In the meantime chop onion, and butternut squash. Add to a large pot, or sauté pan. Add water, and cover. Bring to a boil then turn down heat to low. Simmer for 10-15 minutes, or until the veggies are nice and soft.
While the vegetables are cooking, cook pasta according to package directions.
While veggies and pasta are cooking, measure out your spices, and add to small bowl. Set aside.
Add lemon juice and dijon mustard to a separate small bowl. Whisk together and set aside.
Once veggies are done, drain and set aside with cover on.
When pasta is done, make sure to take out your 1/4 cup of pasta water and set aside.
Drain the pasta completely. Add some olive oil to pasta, and mix around. This helps prevent it from clumping up and sticking together while you prepare the cheese sauce.
Add the veggies to a high speed blender.
Add spices, lemon juice/dijon mustard mixture, pasta water, and cashews to blender.
Blend together on high speed. If needed, take a spatula and scrap the sides or top of blender to make sure everything is getting involved in the blend.
Pour cheese sauce on top of pasta, mix around to combine.
Enjoy!!!