Combine all ingredients and mix well, season to taste with sea salt and crushed red pepper, if desired.
For the cucumber salad
Thinly slice cucumbers, preferably using a mandoline. Combine with chopped peppers and sliced scallions.
Toss salad with dressing. Can be served immediately but best if allowed to marinate for at least 1 hour in the refrigerator - can be made the night before and allowed to marinate for best favoring.