Also known as a Romaine lettuce is a variety of lettuce which grows in a long head of sturdy leaves with a firm rib down the centre. It is so called because it is understood that it originated on the Greek island of Cos (Kos). Cos lettuce is distinguished by an elongated head; stiff long, narrow, dark green, leaves and a coarse texture, with a distinctive rib almost to the tip of the leaf. The outer leaves can taste slightly bitter, however the inner leaves make up for them in sweetness.
Lettuces need to be really fresh to taste good, so avoid those with any signs of wilting or yellowing. To prepare pull off as many leaves as you need from the base, then wash, drain and shake well to dry them. Don’t allow lettuce to soak in water, as it softens the leaves. Chop as required or enjoy whole. Use them to make an authentic Caesar salad. You can also use Cos in stir-fries.
A typical 100g portion contains 15 calories, 2.87g carbohydrates, 1.36g protein and 0.15g of fat.