1 1medium sweet potato/yam, diced 1sliginger 0.33333333333333brown suger piece 0water, enough to cover sweet potato dices In a pot of appropriate size, bring water to boil, then add ginger slice and sweet potatoe dices. When the mixture begins to boil, turn heat down a bit to let mixture bubble for 15-20 minutes. Add 1/3 of a brown sugar piece, then turn heat up to bring mixture to boil. Let it boil until sugar has dissolved completely. The soup is ready to be served.