A banana is an edible Earth fruit with a sweet taste.
Nancy Ransom ate a banana while talking to Leonard McCoy. (TOS novel: The Great Starship Race)
Spock ate a banana which had been offered him by Lucas Freed. (TOS novel: Black Fire)
Peter Joseph had an allergy to bananas. (STA novel: Three)
Turrok ate a banana which had been offered him by the USS Enterprise-D crew. (TNG novel: War Drums)