Step 1: Mix sugar and yeast in warm water and let it sit till frothy.This may take 10+ minutes.Mine took around 20 as it is very cold here. In a big bowl, mix flour and salt. Make a well in the middle and add the yeast mix and 1/4 cup of milk and knead to form a dough.
Step 2: Add milk as needed to form a smooth soft dough.
Keep the dough in a lightly oiled bowl turning once and let it sit covered for at least 3 hours or until it doubles in size. Meanwhile mix together the ingredients for filling and keep aside. You can use whatever nuts you want.
Step 3: With oiled hands take small portions of the dough, shape it into a flattened round, put as much filling as needed into the round and re wrap it to form a ball covering the filling tighlty and then gently flatten it again. This flattening can also be done at cooking time though. It looks like.
Step 4: Heat a skillet on medium heat and pan fry flattened hotteok on both sides pressing occasionally on top with a turner/spatula so that the filling gets cooked. This takes a few minutes per side only. Serve warm or at room temperature.