
In a large bowl, add the drained tuna and gently flake it with a fork. Add the tomato, jalapeño, red onion, and cilantro.
In a small bowl, whisk together the mayo, sour cream, Mexican crema, lime juice, pickled jalapeño brine, salt, and black pepper.
Pour the dressing into the large bowl and toss until everything is well coated. Gently fold in the diced avocados.
Serve immediately with crackers, tortilla chips, tostadas, or lettuce cups.