Cos lettuce is a long oval shaped lettuce with leaves ranging from light to dark. Cos lettuce has a crisp crunchy texture and a subtle more savoury flavour. Nutrition: Cos lettuce is low in sodium with virtually no fat or cholesterol. It is a good source of dietary fibre as well as Vitamin A, C and K meaning it’s great for your eyesight, blood and immune system. Storage: Lettuce can be covered in plastic and stored in the fridge for up to two weeks. Ideal Use: Cos lettuce is best known for its use in Caesar salad. It is also great for a bit of extra crunch on a sandwich.