Season chicken with salt, black pepper, sugar, garlic and scallion (green onion). Marinate the chicken overnight of at least one hour before frying.
Remove scallion from chicken and, on high heat, fry the chicken in cooking oil for 2 to 3 minutes on each side, until browned. Remove chicken from pan.
Remove half the cooking oil in pan and use remaining oil to fry onions and bell peppers until onions are transparent.
Add thyme, hot pepper sauce, tomato ketchup and 1 cup of hot water to pan and stir; taste gravy and add 1 tsp of salt, if needed; let simmer for 5 minutes.
Add chicken to gravy. Add 1 cup of hot water and turn heat to Low and cover pan. Simmer chicken for 30 minutes or until it is tender and the gravy has thickened.