Peel the sweet potatoes and slice them. Soak in water. Measure the sugar and salt.
Steam or microwave the sweet potatoes until a bamboo skewer passes through easily.
Place them in a food processor with the sugar and salt.
Blend until smooth.
Pour the mixture into a mold dampened with water. Cover tightly with plastic wrap, and press with a card or board to level. (The amount shown in the photo is a doubled recipe.)
It's best to have another mold to use to press to level.
Once it has cooled down slightly, store it in the fridge.
Cut into suitable sizes, and enjoy!
Story Behind this Recipe
I received some Narutokintoki sweet potatoes, but since I don't really like sweet potatoes, I made yokan, which is my son's favorite. It's easy and tasty, so I posted it here.
Sweet potatoes with lots of moisture are not suitable for this recipe. Blend the hot sweet potatoes in a food processor, or else they won't be smooth enough. Use any kind of sugar. Adjust the amount of sugar to your liking. Use a plastic container or a lunch box instead of a mold.