Making plates disposable

I came across this little concept in Sri Lanka, where many restaurants cut down the amount of effort required to clean dishes by first putting a plastic sheet atop a standard ceramic plate.

Take a clean plate.

Add single plastic sheet.

Put food on top of sheet.

Serve.

And after the meal has been consumed, you simply wrap up the plastic around the food and pitch it out.

Of course, this is not a perfect solution, since it introduces additional waste plastic into the process. I am not sure if the added plastic waste is offset by the saved dishes soap and water.  It seems that this plastic sheet probably uses LESS plastic than if they simply used disposable plastic plates.