Stay away! There are many, many other places to go in the area.
The people who run the Bozkurt Cafe on the beach have no respect for you and are there with the sole intent of ripping you off.
If you must go, take your own food but as the cafe spreads itself out over most of the area, it is hard to avoid. They will charge you astronomical prices and argue with you with such nerve it has to be believed.
Avoid at all costs.