Caper

A caper was a small pickled bud of a Mediterranean Earth plant of the same name.

Potato casserole was a favorite dish of Miles O'Brien that contained capers. O'Brien's wife, Keiko, disliked the "little dark things" (capers) it contained. 

Capers were used in a sauce – along with mustard, shallots and onions – served with shrimp remoulade at Sisko's Creole Kitchen when Jake and Benjamin Sisko visited in 2372.