To make sweet potato puree: You will need 1-2 medium sized sweet potatoes. Wash and peel sweet potatoes. Place prepared potatoes in a medium size pan, cover with water, and place on the stove. Bring pan to a boil and continue to boil until the sweet potatoes are tender when pierced with a fork, about 20 minutes. Cut sweet potato just enough to put into a food process or blender. Add a little bit of reserved water until sweet potatoes are creamy.