Check the vegetables (courgettes, carrots and peppers) and cut them into thin slices. For the batter: Use cold ingredients for preparation. Pour the 00 flour and the rice flour into a bowl and transfer everything to a container full of ice. Then add the iced sparkling water. Stir to get a lumpy batter. Heat the oil in a wok and let your vegetables fry for ½ minutes. A little salt and a sweet and sour sauce to finish.