Mix all ingredients except sour cream and meat in medium bowl until blended. Remove 1/4 cup vinaigrette mixture; mix with sour cream in separate bowl. Refrigerate for later use.
Add meat to remaining vinaigrette mixture; mix lightly. Refrigerate 1 hour to marinate.
Heat grill pan on medium-high heat. Meanwhile, remove meat from marinade; discard marinade. Thread meat onto 10 small skewers.
Grill skewers 6 to 8 min. or until meat is done, turning occasionally. Serve with reserved vinaigrette mixture.