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BLEND first 7 ingredients and 1/2 cup pineapple in blender until smooth. Pour over steaks in shallow glass dish; turn to coat both sides of each steak. Refrigerate 30 min. to marinate, turning after 15 min.
HEAT grill to medium-high heat. Remove meat from marinade; discard marinade. Grill steaks 3 to 4 min. or until done (160°F), turning once. Cut into thin slices; keep warm.
REDUCE grill to low heat. Place tortillas on grill grate; top with cheese. Grill 1 min. or until cheese is melted. Transfer to plates; top with meat, onions, cilantro and remaining pineapple. Fold in half. Serve with lime wedges.