Remove the bones from the chicken thighs using a sharp knife (see note 2).
Heat the oil in a skillet or wok over medium heat. Place all the thighs in the pan, skin side up, and keep them as flat as possible.
Once the bottom side is browned, flip the chicken pieces and add the scallions to fry together.
When the skin side turns golden, add light soy sauce, dark soy sauce, sugar, and water. Cover with a lid and let it braise over medium heat for about 7 minutes.
Remove the lid and flip the chicken so the skin side is facing up. Increase the heat to high. Add sliced lemon and continue to cook, uncovered, for another 5 minutes or so. Optionally, garnish with finely chopped scallion greens.
Serve the chicken thighs whole or sliced into strips, with the thickened sauce.
Notes
1. For optimal flavor, use skin-on chicken thighs or other flavorful cuts like leg quarters, wings, or drumsticks. Just be sure to adjust the cooking time as needed. For a more convenient option, boneless thighs—often sold skinless—also work well.2. You can also cook the thighs bone-in, then remove the bones after cooking. Just extend the cooking time by 2–3 minutes.