A Cobb salad is a composed salad of chopped ingredients arranged in distinct rows over a bed of lettuce, rather than tossed together. It originated in the 1930s at the Brown Derby restaurant in Hollywood, where owner Robert Cobb is said to have created it from odds and ends in the kitchen as a late-night snack. The classic version layers diced chicken breast, bacon, hard-boiled egg, avocado, tomato, blue cheese, and chives or scallions over romaine or iceberg lettuce, finished with a red wine vinaigrette. Common variations swap in turkey or ham for the chicken, or add other vegetables and cheeses, but the row arrangement is the defining feature that sets it apart from a tossed chef's salad.