Dry the chicken with a paper towel and cut into portions. In a bowl, combine turmeric, salt and ground pepper. Place the chicken in a bowl, mix well and marinate for 20 minutes. Heat the oil in a WOK or conventional frying pan. Sauté the chicken pieces over high heat until golden brown (about 4 minutes). Reduce heat to medium and brown the chicken, turning occasionally, for 10 minutes. Cut the onion into thin rings. Add the onion and sugar to the pan with the chicken. Cook, stirring constantly until the onions are browned (7-8 minutes). Remove chicken pieces from pan and place on paper towels to remove excess fat. When serving, place the onion on top of the chicken from the pan.