These Persian cucumbers were so delicious we skipped adding anything and ate them as is. In fact, a good portion of them disappeared before the main dish was served. These are not technically "seedless" but the seeds are small and soft and entirely edible. The skin is generally edible too unless you happen to find a deviant grocer who has felt the need to wax them. If waxed it is better to peel them, alas.
Similar to Japanese cucumber these are crisp and slightly sweet with, common to all cucumbers, a high water content. They can go "mushy" pretty quickly if stored one atop the other in a closed container. Don't wash them until ready to use and weed out any that have fainted in the crisper. Like Victorian aunts, if one keels over the others will follow suit.
We especially like these cucumbers (had the remains for lunch today) sliced and sprinkled with sushi vinegar or other seasoned vinegar containing a bit of sugar. The salt plus sugar content in the vinegar perks them up but doesn't mask the delicate taste as a heavier or oily dressing might do.