Select the sauté button. Add olive oil.
Sauté onions for 5 minutes. Add garlic, celery, carrots, beets, and spices. Cook for additional 5 minutes, stirring occasionally. Add water, the cover, and cook under pressure, setting for 15 minutes using the + button to change time. Heat water for pasta.
When done, carefully release steam. Once depressurized, uncover and let cool a few minutes (cooktop - remove pot cover). Using a ladle, spoon in 2 batches to a Vitamix Blender. Start on low speed and increase speed gradually. Process until desired texture, adding more water for a thinner consistency. Pour into a small pot between each batch.
Reheat using saute setting and stir in nutritional yeast, lemon juice, and a few grinds of fresh pepper. Adjust seasonings, if necessary. Cook pasta according to directions.
Pour on top of cooked pasta. Top with chopped fresh basil and serve.