Today I discovered Superstore has online videos with one to two-minute "how-to" and recipe clips. Click on the "recipes" and scroll through the pages to see what I found...
... a video, Beautiful Veggie Hors D'Oeuvres, shows how to make cucumber flower cups!
I used an English cucumber to try this for myself. It works! Even the "twist gently to separate" part was actually very simple. With some practice, I think I could make the sides thinner which would make the cups even more delicate.
Filled with dip, these would be a nice addition to a veggie platter.