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All that you need.
Drain the canned tuna. Then with a fork smash the chunks.
Slice and dice it all. Well not the key limes.
Add however much salt and key limes you want. Avoid getting the seeds in your ceviche.
Add everything else then mix.
Add it to a tostada, open a beer and enjoy.
I do the same with fresh shrimp. Always use fresh key limes or limes. Lemons are okay. If it's a hot day after mixing I put it in the fridge to cool a bit.