What is D.F.S. in sushi?

"D.F.S." is not a common or recognized term in the world of sushi. It's likely you're thinking of a different acronym or term that is related to sushi.

Could you please provide more context or information?

For example:

* Where did you see or hear "D.F.S."?

* What was the context of the information?

* Are there any other words or phrases associated with it?

With more information, I can help you figure out what "D.F.S." might refer to in the context of sushi.