In bowl, combine first 4 ingredients and juice of lime. Season with salt and pepper. Divide meat into 4 portions, form each into a burger. Make indentation in center of burgers. Season burgers with salt and pepper. *Heat grill. Brush burgers with oil. Grill until done. Top each with a slice of cheese during last minute of cooking. Place burgers on bun bottoms, top each with lettuce, tomato slices, onion slices and avocado mixture. Cover with bun tops.
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