Cut the sweet potato into 1 cm slices and soak in a bowl of water. Combine all the seasoning ingredients except the salt in a separate bowl.
Microwave the potato slices until tender. (It took me 4.5 minutes at 600 W.)
Heat oil in a pan and saute the sweet potato slices on both sides. Turn off the heat and add the combined seasoning ingredients.
Shake the pan to distribute the seasoning ingredients evenly (the sauce should thicken up with residual heat. If it doesn't, cook over low heat until it does).
Add a pinch of salt to finish.
Good for bento, too!
I edited the recipe to reduce the amount of katakuriko. Adjust the amount to taste.
Story Behind this Recipe
I added ginger to a standard side dish.
Adjust the microwaving time. If a toothpick can easily pierce through the potato, it's done. It's best to add the seasoning ingredients after turning the heat off to prevent the katakuriko clumping. Adjust the amount of ginger to taste. It may be too spicy for small children to eat more than the amount listed.