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MIX first 3 ingredients until well blended. Add 1/4 cup sauce to chicken in medium bowl; toss to coat. Refrigerate 30 min.
HEAT grill to medium-high heat. Remove chicken from sauce; discard sauce. 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 sauce.