@anika
Cholesterol is present in animal products like butter ,ghee,egg yolk and non veg items.
It is not present in vegetable oils like sunflower ,groundnut or soyabean oil so if dhokla and popcorn are prepared in vegetable oil there will be no cholesterol.
But beware of trans fatty acids in reused vegetable oil,which is a major contributory factor in increasing VLDL and LDL (bad cholesterol)in the body.