Bring 8 cups (2 liters) of water in a small pot to the boil.
In the meantime, peel and cut up sweet potato into about 1" (2.5 cm) pieces.
Add sweet potato cubes to water and boil until soft (about 15 minutes).
Add all ingredients but basil into a powerful food processor and process until smooth.
Taste and season again if necessary.
Wash and chop basil for decoration.
Serve with favorite crackers and/or raw veggie sticks