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.
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.
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.
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.