Mix all the ingredients of the marinade in a small mixing bowl. Set aside.
Pound the chicken breasts until they are about 1cm thick.
Pour half the marinade in a shallow non metal baking dish. Add chicken breast and pour the rest of the marinade over the chicken.
Cover with a plastic film and place in the refrigerator to marinate for at least 8 hours.
Preheat your grill to medium-high heat
Remove the chicken breasts from the marinade place them on the grill. Close the lid and let the breasts cook for about 5-6 minutes then flip them over.
Continue cooking for about 5 minutes, or until cooked through.
Allow the chicken breasts to cool completely in the fridge before cutting them into strips.