Marinate the chicken in half the lemon juice and scallion.
Grill the chicken thighs on the barbecue for about 8 minutes on each side.
Remove the skin and cut into small pieces.
Mix with coconut, onions, lemon juice, and chilies.
Add salt and pepper.
Serve with tortillas.
12 hours (or more) before eating the sauce, combine all ingredients and refrigerate.
