The main ingredient in traditional clam chowder is clams, which are the star of this hearty soup. Typically, the dish includes diced potatoes, onions, and celery, with a creamy base made from milk or cream. New England clam chowder is particularly famous for its rich, creamy texture and is often thickened with flour. Variations exist, such as Manhattan clam chowder, which uses a tomato base instead of cream. The combination of fresh clams and vegetables creates a comforting dish that is especially popular in coastal regions of the northeastern United States.