I was on my honeymoon in St. Lucia a few years back and had a small salad with lunch. One of the greens used in the salad was truly memorable. It was bright and spicy, with a distinct clear your sinuses horseradish/wasabi type of heat at the end. I asked the manager what it was and he told me it was rocket, but no rocket/arugula that I've tasted before or since has that horseradishy character.
So I've been left wondering if he was right, how can I get my hands on some of this supercharged rocket, or if he was wrong, what was it?? Any thoughts are welcome.