Activate the yeast by stirring it into lukewarm water with sugar and let it rest for 5-10 minutes.
Mix the salt into the flour and then add the yeast-sugar water to the flour to make a smooth dough that is pliable without being sticky
Let the dough rise for 60 minutes until it doubles in size
While the dough is rising, mix the filling ingredients
Punch down the dough, divide, and form it into 8 equal balls
Make an indentation in the center of each ball and put 1/8 of the filling into each indentation; gather the dough's edges to form a new ball with the filling in the center
Heat a pan with oil and place the dough balls on the pan with the seams down and press them flat to a height of 6-8 mm.
Let the hotteok brown for 2-3 minutes on each side until they are golden and crispy
Serve hotteok while they are warm.