Meanwhile, bring a pot of water to a boil, then cook pasta according to directions. Continue with steps below while pasta is cooking. **Once pasta is done, strain then drizzle 1 tbsp olive oil over the top and stir once to help avoid sticking together while the other ingredients finish cooking.
While pasta is cooking, transfer 1 cup of pasta water to a glass or bowl and add cashews to soak for about 10 minutes. **After soaking, strain cashews to remove soaking water, leaving the cashews in the blender.
While pasta is cooking and cashews are soaking, heat another large pot or skillet with 3 tbsp olive oil over medium heat.
Once hot, sauté onions and garlic until translucent, about 5 minutes.
Add fire roasted tomatoes, vodka and salt, and simmer on medium-low for 10 minutes.
When 10 minutes of simmering is up, ensure the cashews have been strained before using a ladle or pouring the simmered mixture into a blender, along with the remaining sauce ingredients.
Blend with the lid on (center cap undone to allow steam to escape) with a kitchen towel over the top for several minutes until smooth.