An osol twist is a Romulan confection food that is known for its tart taste.
Valdore was not fond of osol twists as he found them too sour, although his servants frequently served them to guests at his home. (ENT - The Romulan War novel: Beneath the Raptor's Wing)
In 2375, Senator Kimara Cretak recommended osol twists to Kira Nerys after Kira told her she disliked Bajoran jumja sticks for being too sweet. (DS9 episode: "Image in the Sand")