Haring. In Amsterdam it’s more common to eat herring with toothpicks—often topped with a Dutch flag—in bite-size pieces out of a waxed cardboard plate, with chopped onions and gherkins (or pickles) on the side. You can also have the fish, onions, and pickle in a more filling broodje haring, or herring sandwich.
: https://eatyourworld.com/destinations/europe/the_netherlands/amsterdam/what_to_eat/haring