Mix chicken with vinegar, 1 tbsn soy sauce, chilly powder,paprika, salt, and beaten egg. Keep aside for 2 hours. Slice onion and green chilly thin. Heat oil in a pan and deep fry chicken pieces. (Keep aside the remaining marinade). Remove from oil keep aside. Remove oil from pan leaving about 1 tbsn. Add onion and green chillies and sauté till onion is translucent. Add the remaining marinade and cook till thickened. Add chicken pieces and remaining soy sauce and little salt. Heat through. Serve hot