Fill a pot with water and add the carrots, celery, and onion. Bring to a simmer and cook until the vegetables are soft, about 20 minutes. Once done, reserve 4 cups of the vegetable cooking water. Then, remove the vegetables from the pot and set them aside.
Step 2
In a separate pot, fill with water and add a pinch of salt. Bring to a boil, then add the pasta. Cook according to the package instructions, approximately 12 minutes. Before draining, reserve 1 cup of the pasta water.
Step 3
Place the cooked vegetables into a food processor. Add the 4 cups of the reserved vegetable cooking water. Blend until smooth.
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