Before starting, make the scallion sauce. Heat the oil in a wok or saucepan over medium heat. Add the white parts of the scallions. Fry slowly until they are aromatic and the white parts are lightly browned.
Add the green parts of the scallions, soy sauce, dark soy sauce, sugar, salt, and white pepper to the pan.
Stir well and let the mixture cook for another 1-2 minutes until fragrant.
Remove from heat and allow the sauce to cool before transferring to an airtight container. You will only use 2-3 tablespoons of the sauce for this recipe.
Reheat the chicken and rice. Mix the chicken, rice, scallions, salt and pepper, scallion sauce and shallot oil (or sesame oil) in a bowl.
Stir to mix it all together. Serve.