Witlof, also known as Belgian endive, is a bitter leafy vegetable that is popular in European cuisine. Although it's commonly known as witlof or Belgian endive, it's also referred to by a number of other names, including French endive, chicon, and witloof. In addition, it can sometimes be confused with chicory, which is a similar vegetable with a slightly different taste. While witlof may not be a familiar ingredient to everyone, its unique flavor and versatility make it a popular choice for salads, appetizers, and main dishes in many different cultures.