Toss the onion, peppers, garlic, cilantro, ground pepper, lime zest and juice, fish sauce, and soy sauce into a blender, and puree.
Marinate the chicken in the fridge for at least 2 hours or up to 8 hours. Don’t marinade the wings longer than 8 hours because the acid will make the meat mushy.
Take the wings out of the refrigerator 30 minutes before you intend to cook them.
Cook the wings over medium-hot coals (or with gas grill burners set to medium) for about 15 - 20 minutes, turning once, until the fat has rendered and the skin turns crisp and golden.