HEAT barbecue to medium heat.
CUT avocados lengthwise in half; remove and discard pits. Scoop out flesh of each half in one piece with large spoon. Add to lemon juice in medium bowl; turn over to evenly coat both sides of each. Transfer avocados to barbecue; set juice aside for later use.
GRILL avocados 4 min. or until lightly browned on both sides, turning after 2 min. Return avocados to bowl of juice; turn over. Let stand in juice until cooled. Drain; discard juice. Cut avocados into 1/2-inch cubes; place in large bowl.
ADD all remaining ingredients except pine nuts; mix lightly. Transfer to platter; top with pine nuts.