Peel your sweet potatoes and chop them to bite-size.
Soak the sweet potatoes in water for 5-10 minutes, rinse, drain, then pat dry.
In a shallow pan and high heat, heat up your oil. Fry the sweet potatoes for 2 minutes on each side. Poke through or taste to check for doneness.
Remove them from the oil once the potatoes are golden brown. Set aside.
In another pan, heat up 1 tablespoon of oil, then add soy sauce, mirin, sugar, and corn syrup. Mix thoroughly until melted and mixed.
Add the fried sweet potatoes and quickly coat all of them in the glaze. Continue mixing it until there is full coverage on each of the pieces.
Transfer to a plate and top with white and black sesame seeds.
Serve and enjoy hot!