In "The Spring Chicken is Coming!", Oona's lunch consists of a SUSHI roll.
On a similar note, the lunch joke in "Ducks in a Row!" was a "Tuba-fish" sandwich. Implying it's okay for mermaids to joke about eating their close relatives...
And in the Cold Open of "The Grumpfish Special!", Gil lifts up the platter to reveal one of the Little Fish.
It should be noted, though, that sushi is the name of the outer covering and not all sushi is fish.
"Ducks in a Row!": Besides the obvious parade pun, the idiom "get one's ducks in a row" means to organize things well, which is exactly what Nonny does at the end.
