Make 3-4 diagonal slits along each side of the fish and dredge in flour. Heat the oil in a wok and fry the fish for 7-8 minutes on each side, or until completely cooked. Remove from pan and drain on paper towels.
To make the Sweet and Sour Sauce, combine the sugar, vinegar, water and tomato ketchup in a saucepan. Add carrots, cook for 4-5 minutes, then add bell