Heat the cooking oil and saute the chopped onion, add in the meat and the rest of the ingredients, spice it up to your liking. Let it cool to room temperature before filling
Divide dough to make about 30 rolls. Roll flat each and fill. Pinch seal the ends of dough. Shape as pierogi shape.
Boil pierogi in a water that mixed with oil and salt. When pierogis float to surface then its cooked.
Serve with sour cream, ground paprika, or anything you desire.