In a small saucepan, add the chopped potatoes, carrots and onion and cover with water. Bring to boil and cook for 10-12 minutes until all the veggies are tender.
Reserve 1/2 cup of the cooking liquid and then strain the vegetables.
Add the vegetables, 2/3 cup of the liquid and all the other ingredients into a blender and begin processing until smooth. If it seems too thick, a bit more of the cooking water.
Serve over some pasta and enjoy while hot! I love to use elbow pasta as the sauce really coats the noodles well :)