Prep the red pepper, shallot and English cucumber as noted above.
Drain the tuna and place it in a medium bowl: mash it lightly with a fork. Add the chopped vegetables, capers, white wine vinegar, olive oil, Dijon mustard, feta (if using) and kosher salt and stir to combine. Taste and add more salt if desired. Stores up to 3 days refrigerated.
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