Rocket (UK) and Arugula (US ... Cos lettuce (UK) and Romaine lettuce (US) The salad ingredient’s U.K. name originates from the Greek island of Kos (previously spelt Cos), where the lettuce ...

Apart from traditional lettuces, such as 'Cos', 'Iceberg' and 'Butterhead', there are many others to try, including loose-leaf types and oak leaf lettuce, radicchio, rocket and endive.