A thin piece of bread or toast that is usually spread with a cheese or similar food item.

O'Brien once made a batch for his cheer-up romantic evening with the bored Keiko on DS9,  though whether home-made or replicated is not specified.

At Quark's brief rival Club Martus, Rom didn't trust his brother to avoid the temptation of sabotage and ran a tricorder over a gift tray of food, apparently canapes. Picard finally won over Admiral Nechayev with some Bularian canapés.