It's a fancy name for fish STEW.
Breaking Bad Season 3, Episode 11
When I was your age,
I lived on one bowl of STEW a day.
Game of Thrones Season 3, Episode 8
I'll save you a bowl of STEW.
Game of Thrones Season 6, Episode 7
and STEW, getting nice and fat and marbled.
Game of Thrones Season 4, Episode 1
I made the bald man cry
into the turtle STEW,
Game of Thrones Season 1, Episode 6