I was in Ireland recently; ordered a mixed salad at a restaurant and discovered the spiciest lettuce I've ever had in my life. I asked the waitress about it; she didn't know, she asked the chef and she told me it was Rocket Lettuce. Back home, I just figured out Rocket lettuce is the English name for Arugula. Well, the lettuce I tried was definitively not the arugula that I know. This lettuce was 20 times spicier and it looked different. I'm posting a picture. Can anyone tell me what it is?