St Andrews, Advert in 'Mr Milano's' Chip-Shop Doorway, South Street,

A deep-fried Mars bar is an ordinary Mars bar normally fried in a type of batter commonly used for deep-frying fish, sausages, and other battered products. The chocolate bar is typically chilled before battering to prevent it from melting into the frying fat, despite a cold Mars bar being able to fracture when heated.

The dish originated at chip shops in Scotland as a novelty item, but was never mainstream. Since various mass media began reporting on the practice in the mid-1990s, in part as a commentary on urban Scotland's notoriously unhealthy diet, the popularity of the dish has spread. The product has not received support from Mars, Inc., who said "deep-frying one of our products would go against our commitment to promoting healthy, active lifestyles." Quoted from Wikipedia