A recipe that's worked well for me...

Mix of equal parts of worcester, soy sauce, olive oil in a bag or plastic container. Add 1 tsp ea. of garlic powder & cajun seasoning to the mix. Let the meat soak for 30min to several hours.

Grill over good coals, to rare like a steak. You may have to baste the breasts with some of the marinade just before flipping them (once only).
Sprinkle salt & pepper or cajun seasoning while the meat is resting.Slice, serve and enjoy.