Add the onion and ONLY 1 cup of the broth to a large pan over medium to medium-high heat. Cook for about 8 minutes until the onion is very tender.
After 8 minutes, add the garlic and cook a couple of minutes more, stirring often. All of the broth should have evaporated by now.
Add the cooked veggies (the onion and garlic) to a blender. Start out by adding JUST ½ cup more of the remaining broth and add the remaining ingredients (salt, pepper, cashews, starting with JUST ½ tablespoon lemon juice, nutritional yeast).
Blend on high for a couple of minutes until very creamy and smooth. Add any more broth to reach desired consistency, if necessary.
Taste and add any more salt & pepper or lemon, if desired.
Serve over preferred pasta. Garnish with parsley, lemon zest and salt & pepper, if desired. Add any veggies you like.
