Press the chicken fillets between stacks of paper towels to remove surface moisture.
Set the stove on HIGH and heat the cooking oil in a pan.
Arrange the chicken fillets in a single layer, skin side down, and cook until the skins are lightly browned. Flip to brown the opposite sides.
Stir together all the ingredients for the sauce with a quarter cup of water.
Pour the mixture over the chicken and bring to the boil.
Cover the pan, set the heat to low and cook the chicken fillets in the sauce for 10 minutes, flipping them over halfway through.
Uncover the pan, turn up the heat to HIGH and continue cooking the chicken fillets, flipping them every minute, until the sauce has thickened and reduced.
Scoop rice into shallow bowls, arrange a chicken on top, drizzle in some sauce and garnish with scallions.