Prep the tomatoes, onion and green pepper.
Peel the cucumber if you’d like; remove the seeds from the cucumber, and cut the cucumber in half or quarters lengthwise; slice the cucumber into 1/4-inch slices. Place the cucumber chunks in a colander and sprinkle with kosher salt to pull some of the water out of the cucumber - let drain for at least an hour.
While it is not traditional, I like to add some Romain lettuce to this. I only use the lighter green lower parts because they are crunchier, and I keep the darker green upper leaves for a garden salad later.
Mix the salad veggies and refrigerate for an hour or more.
Blend the ingredients for the dressing.
For an added touch, sprinkle the feta cheese with some oregano and black pepper.
Just before serving, add the feta, olives, and dressing and toss through.
Garnish with the pepperoncini and serve.