Prepare marinade bath for the chicken.
A sealable plastic bag is great for this.
Put sugar and white wine in.
Massage the chicken tenderly to help sugar and white wine diffuse into the chicken.
A slightly high PH of white wine and sugar does a very good job in making chicken tender and juicy inside.
Hydrogen ions can act like little Ninja.
Keep the chicken in the marinate for 4 to 5 hours or more.
Give a gentle massage to the chicken every hour or so.
If you use the chicken for Western style cooking, you can add about 1 tbp of olive oil to the marinate.