MIX first 3 ingredients until blended. Combine 1/4 cup peanut sauce with chicken. Refrigerate 30 min. to marinate.
HEAT grill to medium-high heat. Remove chicken from marinade; discard marinade. Thread chicken onto 8 skewers.
GRILL 5 to 7 min. or until chicken is done, turning after 4 min.; place on platter. Sprinkle with nuts and onions. Serve with remaining peanut sauce.