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Rach uses canned tuna (pantry staple alert!) and homemade guacamole to make her easy open-faced Mexican-style tuna melts.
For more of Rach's easy recipes ideas for canned tuna, check out her French Tuna Sandwiches and Sicilian Tuna Pasta.
Preheat broiler with rack in center.
In a bowl, combine red onion, jalapeño pepper, garlic, and, if using, cilantro and hot sauce. Add lime juice and salt, let stand a few minutes, then combine with avocado and mash it up with a fork. Fold in tuna and pile evenly onto the halved and toasted English muffins. Top the tuna salad with sliced tomatoes and cover the tomatoes with the cheese, then broil to melt cheese. Top with pickled jalapeños.