Halászlé, also known as fisherman's soup, is a traditional Hungarian dish that originated in the Danube River region. It is a spicy and flavorful soup made with various freshwater fish, paprika, and other spices. The soup is typically served hot and garnished with fresh parsley. Halászlé is a must-try for seafood lovers visiting Budapest, as it showcases the unique flavors of Hungarian freshwater fish.