Slice cucumbers lengthwise, and remove seeds. Cut 1 cucumber half into 1/4-inch dice, and transfer to a small bowl. Add olive oil, vinegar, feta cheese, salt, and pepper, and toss well to combine. Add oregano, and toss again.Advertisement
Use a vegetable peeler to remove 1 or 2 long strips of peel (if cucumbers are already peeled, remove a strip of flesh) from the underside of each cucumber half so they will sit without tipping. Divide cucumber-and-feta mixture among them.
Slice cucumbers on a slight diagonal into 1 1/2-inch sections, and serve immediately.
If possible, use English cucumbers. They have fewer seeds and are usually not waxed.