1. In a small bowl, combine the drained tuna, avocado, cilantro, sriracha, mustard, and black pepper. Mix well until no more chunks of avocado remain.

2. Wash and pat dry 6 Bibb lettuce leaves. Evenly divide the tuna among each lettuce leaf and top with carrots, cucumber and more sriracha if desired. Serve or store lettuce wraps in an air-tight container for up to 24 hours.