I especially love the thin-skinned varieties of cucumbers—Persian, Armenian, English. Their peels are thin and delicate, not bitter like regular cucumbers, so they don’t require peeling. They’re also not usually as seedy as their thick-skinned cousins. Persian cucumbers, about 5 inches long In this salad, we are tossing thinly sliced cucumbers with thinly sliced red onion, red radishes, a few mint leaves, and feta cheese, all together with a simple olive oil and vinegar dressing.