Cut sweet potatoes into bite size pieces.
Soak in water for 5 minutes.
Drain water and cover bowl with plastic wrap.
Microwave for 5 minutes, until the potatoes turn yellow.
Dry potatoes in paper towel.
Fry potatoes in oil on medium high heat, turning individual potatoes when needed.
Remove when crispy.
In a pan on medium heat mix sugar, soy sauce, mirin and add potatoes.
Make sure to evenly coat the potatoes.
Finish with sesame seeds and serve.