Peel and chop the cucumber into bite sized pieces.
Chop the tomatoes and green pepper into similar sized chunks, removing the seeds.
Slice the red onion into thin rings, then cut the rings into bite sized pieces.
You can use sliced or whole olives, although I recommend cutting the whole olives in half the long way to make them easier to stab with a fork.
Toss the vegetables together in a medium sized bowl, along with the feta cheese.
Combine all the ingredients for the dressing in a small jar with a lid and shake until everything is well combined. The recipe may make more dressing than you need, so add only as much as you wish.
Pour the dressing over the salad and toss to until vegetables are well coated.