cos lettuce;

Cos lettuce, also known as romaine lettuce (Lactuca sativa var. longifolia), is a cultivar of the common lettuce plant originating in the Mediterranean region, particularly near the Greek island of Cos. It is characterized by an elongated, upright head with sturdy, deeply ribbed leaves that are darker green on the outside and pale yellow-green toward the heart. The leaves are crisp, with a slightly bitter, mineral-forward flavor and tender, succulent texture. Cos lettuce differs from other lettuce varieties in its firm structure and ability to hold up to cooking, though it is primarily consumed raw.

Cos lettuce is most famously the essential ingredient in Caesar salad, where its sturdy leaves withstand hearty dressings and anchovies without wilting. The outer leaves can be separated for use in composed salads, while the inner heart is prized for its delicate flavor and pale color. In Mediterranean cuisine, it appears in Greek salads and is occasionally braised or grilled whole as a vegetable course. Its crisp texture and mild bitterness make it suitable for both raw preparations and gentle cooking methods. The leaves are robust enough for sandwich construction and sturdy grain bowls.