Mix flour, salt, and water until smooth, cover, and let stand at room temperature 20 to 30 minutes. Stir baking powder into batter. Place shortening or oil in a deep fat fryer, insert thermometer, and begin heating over high heat. Dip candy bars into batter, allowing excess to drain off. Fry in 375 degree fat until golden and crisp. Drain on paper toweling.
Recipe from Scottish Fish and Chip Stands