Cos, or romaine lettuce, as they are known have a long, oval head of tightly packed crisp leaves. They are the perfect and traditional base for Caesar salads. Cos is so called as this particular variety of lettuce is thought to have originated on the Greek island of the same name. Lettuce was first cultivated in ancient Egypt for the production of oil from its seeds, after which it began to be bred for its edible leaves. In ancient cultures, lettuce has been regarded as a strong medicinal as well as a sexual wellness plant. It requires fairly low temperatures to grow. Heat makes lettuce produce flowers, called bolting, which makes the leaves very bitter and uneatable. The leaves are harvested at a relatively early stage before they mature.
% of Daily Recommended Dietary Allowance satisfied by 100g of raw produce.