A cherry
A cherry was an Earth fruit. They could be used to make cherries jubilee. (DS9: "His Way")
In 2153, Charles "Trip" Tucker shared an ice cream sundae with Traistana and Veylo. He explained that they were supposed to eat the cherry first, this being a Human tradition. (ENT: "Cogenitor")
Deanna Troi once removed a cherry from a chocolate fudge sundae. (TNG: "The Game")