Bring a large pot of water to a boil. Add in a big pinch of salt and the potatoes and carrots. Boil until tender, about 10-15 minutes. Reserve 1/2 cup of the cooking water and set aside. Strain the potatoes and carrots and add to a high speed blender.
Add the remaining sauce ingredients and the 1/2 cup of reserved water. Blend until smooth.
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