While wearing kitchen gloves, use a sharp knife to finely mince the habanero pepper, removing the seeds. Finely chop the celery and cilantro. Drain the oil/water from the tuna.
Add all ingredients to a bowl and stir well to combine. Taste, then season with additional salt and black pepper if desired.
Spoon the tuna salad into lettuce wraps and top with a little extra cilantro and pickled onions.
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Notes
To store leftovers: Transfer the tuna salad to an airtight container and store covered in the refrigerator for 3-4 days, per USDA.For a milder heat in your tuna salad recipe, sauté the peppers in a small skillet with 1 teaspoon oil for a few minutes, until softened, before adding them to the tuna.