Mix together all of the yeast starter ingredients. Let the yeast eat the sugar for at least 10 minutes. The yeast will look foamy when ready to use.
Mix together all of the dry ingredients.
Mix in the milk, oil, and yeast starter. Cover with plastic wrap and let rise in a warm area for 2 hours.
The dough will have more than double it’s size.
While the dough is rising, mix together all of the filling ingredients.
Heavily oil your hands. If you don’t, the dough will stick to you. Take a piece of dough about the size of a golf ball and flatten it in your hand.
Take 2 tbsp of the filling and place it in the center of the dough. Then carefully crimp the edges together and form back into a ball shape.
You should yield 8-10 hotteok.
Heat up cooking oil in a griddle over medium high heat. Place 4 of the hotteok on the griddle. Cook for 2-3 minutes. Make sure to not overcrowd the griddle since these will be pressed.
Flip the hotteok.
With a wide spatula, press down and flatten the hotteok. Cook for another 2-3 minutes.
Let the hotteok rest on a wire rack before serving.