Iceberg lettuce is a pale, round, tightly packed lettuce which has crisp leaves with a refreshing flavour. It stays fresh longer than any other type of lettuce, if kept at a constant cool temperature. It is the most popular type in the US and goes in fast foods like burgers and sandwiches. 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.