Agatha Christie's Hercule Poirot has a friend who is an author, named Ariadne Oliver. What is her penchant, which she cannot refuse?

Ariadne Oliver, is a famous author in Agatha Christie's Poirot books. She has a penchant for apples. She loves all varieties of apples.

Mrs. Oliver is also known for her unkempt hair, her murder mystery novels featuring a Finnish detective, and her love of driving fast.

Hercule Poirot and Ariadne Oliver worked together to solve several mysteries in works by Agatha Christie such as; Cards on the Table, Hallowe'en Party, Mrs. McGinty's Dead, Dead Man's Folly, The Pale Horse (Mrs. Oliver's only appearance without Hercule Poirot), Third Girl, and Elephants Can Remember.