- Preheat broiler. Stir together tuna, mayonnaise, green onions, celery, pickles, parsley, mustard, salt and pepper; set aside.
- Place bun halves on foil-lined baking sheet. Broil for 1 to 2 minutes or until lightly toasted; spread with butter.
- Top with tuna mixture, tomato slice, avocado and cheese slice. Broil for 1 to 2 minutes or until cheese melts.
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