Drain and rinse canned beans thoroughly under cold water.
Finely chop the onion, cucumber, and parsley.
In a large bowl, combine beans, onion, cucumber, capers, parsley, and oregano.
In a separate small bowl, whisk together red wine vinegar, olive oil, Dijon mustard, honey (if using), salt, and pepper.
Pour the dressing over the salad and toss everything well.
Taste and adjust salt or acidity if needed.
Chill for 15–30 minutes before serving for best flavor.
Serve as a main or side dish, and enjoy!