Yes definitely cover the wok on medium flame otherwise chicken does not cook from inside. That’s the best way to do it. Otherwise if you are using pieces other than breast the you can boil them first in a little bit of water. All the chefs have slightly different versions on how to make zinger burger. I have made it by coatin. With cornflour and atta, by adding egg, bread crumbs, and mostly recently I tried it with rice flour. if you are doin. Chicken breast then you can pan fry in medium fly with fry pan covered. Fry on both sides.