In a medium bowl combine the remaining ingredients (but not the skewers) and stir till fairly smooth (it's not a big deal if there are a few chunks). Pour onto the chicken in the zip close bag. Seal it up and let marinade in the fridge for 2-4 hours.
Once done marinating soak wooden skewers in water for 10 minutes to prevent burning on the grill. Thread chicken onto the wooden skewers.
Heat grill to medium. Grill for 3-4 minutes on each side or until internal temp reaches 165 degrees F. It wont take too long since they are tenderloins and should be fairly thin.
Remove from grill and serve with peanut dipping sauce (see additional recipe).
You can sprinkle with fresh cilantro for a garnish as well (optional).
For the Dipping Sauce:
Place the peanut butter in a small dish and heat in microwave for 10-15 seconds to soften.
Add remaning ingredients, (more or less water depending on how thick you want the sauce) and stir to combine.