In the meantime, take a steamer and add water in it until its base is covered up to a couple of inches. When the water starts to boil, add all the yellow-fleshed sweet potatoes in it, and cover the steamer with its lid. Cook it for around 30 minutes or until the potatoes are tender. Take them out, drain all the water and set them aside to cool.
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Take a saucepan. Add butter, brown sugar, salt and water in it, and place it over medium heat. When the sauce becomes bubbly and the sugar is completely dissolved, add all the slices of the sweet potatoes in it.
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