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Step 1
Add chopped onions to a small bowl and cover with cold water. Set aside for 5 minutes, drain, and then rinse. This step helps to remove some of the 'raw' flavor of the onion so that it does not overpower the salad.
Step 2
Meanwhile, in the bottom of a large bowl, whisk together the vinegar, olive oil, mustard, salt and pepper. Taste the dressing and then adjust with more salt/pepper. If the dressing tastes too abrasive, whisk in 1 to 2 teaspoons of honey or maple syrup to balance out the vinegar.
Step 3
Add the beans, drained onion, cucumber, parsley, capers and dried oregano. Toss well, cover and chill in the refrigerator at least 1 hour to allow the beans to marinate in the dressing.
Step 4
The salad will keep stored in an airtight container in the fridge up to 4 days.