A canapé was an appetizer consisting of a piece of bread or toast or a cracker topped with a savory spread.
In 2370, Rom scanned several canapés in Club Martus with a tricorder, suspecting that Quark may have contaminated them as a move against his rival, Martus Mazur. (DS9: "Rivals")
In 2371, Miles O'Brien served canapés which he apparently made himself as part of his romantic dinner with his wife. (DS9: "The House of Quark")
In 2373, canapés were served at Ahni Jetal's birthday party on the USS Voyager. (VOY: "Latent Image")