Mix the chicken, egg, salt, carrot, radish, cabbage, fish sauce, sugar, scallion, cilantro and serrano. Mix well. Add rice flour and mix well. Heat the oil in a skillet. Prepare fritters about 3 inches long and 1/2 inch thick using about 1/2 cup of mixture. Brown them in oil over moderate heat about 2 minutes on each side. Drain on paper towels. Serve warm.