Put a piece of aluminum foil into the wok, then add the left sugar on the high heat until the sugar starts to melt and caramelize. Once the sugar starts to caramelize and smoke starts to come out, reduce the heat to low. Put a grill pan on top of the aluminium plate to hold the chicken and place the marinated chicken on top. Close the lid and let it smoke for about 20-30 minutes (at 15 minutes interval, you can check if the smell is too strong for your liking).