We usually buy a large package of boneless, skinless chicken breasts from a national wholesale vendor, slice the breasts in half and grill the whole batch at once. This way we have a delicious hot meal, can freeze some for a later meal, and stick a few in the fridge for consumption within a week. Therefore, quantities for my marinades are sort of arbitrary; on this one I will probably add more, but the fact that I ran out of tamari limited the use of other ingredients. Approximately, though, for about 10 breasts:
2 T. Tamari (or soy) sauce
2-3 T. Plum Butter (or substitute other jams, I've done sand plum jam)
1 T. Sambal Oeleak
Juice from half a lime
Toss it all together in a big Baggie with the chicken breasts and let it set for 30 minutes or so, then grill over medium heat (and I'm not going to tell you how to grill, but please be sure it's cooked all through).