Add sugar and yeast to water. Mix until dissolved. Set aside.
Sift bread flour, rice flour, and tapioca starch into bowl. Add salt.
Add wet mix to dry. Knead (note: a rice paddle or rubber spatula works best to prevent it from sticking to your hands). Add canola oil. Knead some more. You want good gluten developement so that it makes it is easier to form and more fun to eat.
You can rest the dough overnight, and it will develop a yeasty flavor. Some people like this, but I don't and prefer to make the hotteok immediately.
Cooking:
Videos are worth a million words.
This recipe creates dough that is a little firmer and less sticky than the dough pictured in the video. Forming process is basically the same though, pressing the spoon of sugar into the dough helps create a pocket and makes it easier to wrap up. You can also fry these with as much or as little oil as you want, play around with it and see what you like best. Use a nonstick pan if you have.
Credits to Chris Chang for developing this recipe.