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Screw Iceberg, I think a round lettuce is way better.
I decided to chance my arm on a British Round Lettuce at the supermarket the other day. SO much nicer in a salad or on a cheese sandwich. I heartily recommend you move away from the Iceberg lettuce.
Also, I discovered there is a British Leafy Salad Association, proving there's an website for every half-baked loony.
http://www.britishleafysalads.co.uk/