My great grandfather used to eat the fish with mustard.
I suggest Batampte extra strong horseradish or is it tuv tam?
It is also very good with wasabi. We usually eat gefilta during the daytime Seudah, at night we eat hot fish (not a species)
like baked tilapia, or baked salmon in tomato sauce.
Whatever you choose, have an Oneg Shabbos!