Wash and peel the sweet potato. Cut into bite-size pieces and cook, either by boiling or in a microwave.
When the sweet potato is soft, mash with a potato masher.
In a pot, add water, soy milk and mashed sweet potato and bring to a simmer. Season with salt.
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Story Behind this Recipe
When making potage for my children when they were very young, I would only season it with salt. I actually preferred it to the way it tastes when made with stock and other seasonings, so I've been making it with just salt ever since.
Adjust the seasoning according to your tastes. Do not allow the soup to boil. I add water to make it smooth and extra healthy, it is also nice with milk/soy milk as the only liquid.