Salt. This method works for aluminum pans. Just pour in some oil and add a pinch of salt on top.
Apple cider vinegar. Add the sunflower oil again, and after it heats up, add some apple cider vinegar – let it evaporate over low heat.
Natural butter. The fatty compounds in this product will help prevent burning. Put a spoonful of natural butter in the pan and grease the entire surface.
We have previously written about why food burns to a cast iron skillet.