Belgian endive is a leafy vegetable with tightly packed, elongated leaves that have a slightly bitter flavor. The leaves are typically pale white with red or pale yellow tips and a crisp texture. Belgian endive is often grown in the dark to prevent the leaves from turning green and developing more bitterness. It can be eaten raw in salads, grilled, roasted, or braised, and is popular in both European and American cuisines for its subtle, slightly nutty taste and versatility in cooking.