Name that veggie, originally uploaded by greek58.

I love the farmer’s market in Athens. I try to go at least once a week when I’m here and I often challenge myself to buy something I’ve never seen before. Usually I’m able to query the seller and get some idea about what I’ve bought and how to prepare it … Alas, today I am lost. I bought something the seller called “bitter zuchinni” (in Greek πικρό κολοκυθακι).
I’ve no clue what it is nor how to prepare it.
A bottle of ouzo or masticha (or a kosher Vienna pure beef hot dog if you’re Greek and in Athens over Labor Day weekend) to the person who can guide me in preparing and enjoying this unusual, bitter tasting veggie.