Add all ingredients to a high-speed blender* (starting with the lesser amounts of lemon juice and water) and blend until smooth, scraping down the sides as needed. Taste and adjust, adding more cashews for richness/thickness, more nutritional yeast for “cheesiness,” more lemon juice for brightness, or more salt for overall flavor/balance.
Leftover sauce will keep in a sealed container in the refrigerator for up to 2-3 days. Not freezer friendly.
Notes
*A NutriBullet or similar small, powerful blender will also work well. We didn’t find it necessary to soak the cashews for this recipe, but if you don't have a powerful blender, soaking will help (though it may not be enough to achieve a completely creamy sauce). *Recipe as written makes ~2 cups. *Adapted from our Creamy Vegan Pesto Pasta (30 Minutes!). *Nutrition information is a rough estimate calculated with the lesser amount of lemon juice.