Wash the chicken thighs thoroughly and drain excess water. Cut slits across the chicken thigh about 2 inches long being careful not to cut all the way through.
Rub all the 6 chicken parts with salt.
In a big bowl or container, put in the lemon, soy sauce, ketchup, ground pepper, brown sugar,coke and mix.
Add the chicken parts to the marinate sauce making sure it's completely submerge. Cover with cling film and marinate for at least 12 hours.
Preheat oven to 230° C with broil setting on.
Place chicken on a foil-lined baking sheet and brush both sides generously with the marinate sauce. Put in the oven and grill for 25 minutes then flip the chicken parts to cook the other side for 20 minutes more.
While waiting for the Chicken to be cooked. Prepare the BBQ sauce by adding the left-over marinate and 2 tbsp cornstarch in a sauce pot and in medium heat bring to a boil. Add more sugar if you want more sweetness.
Take out the barbecued chicken from the oven and smother with the BBQ sauce.Serve and Enjoy! Bon Appetit