Place the sweet potato, ginger, water and a good drizzle of olive oil in a saucepan.
Cover with a lid and bring to the boil. Once boiling, reduce the heat and simmer for 20 minutes until the sweet potatoes are soft and tender, stir occasionally.
Use a food processor to puree the cooked sweet potato until silky and smooth.
Add the peanut butter and blend together. Season to taste.
Notes
Before boiling, keep the sweet potatoes in cold water to avoid oxidation.