What is "ijzerkoekje"

thumb|IJzerkoekjes on display

An IJzerkoekje (, iron cookie) is a very specific 'soft' cookie, traditionally eaten by Dutch fishermen, especially in Vlaardingen, one of the main harbours of the Netherlands during the 19th and 20th century. It is an oval cookie over half an inch thick with a cinnamon 'creamy' taste. The cookies were invented in the city of Vlaardingen and are baked on a checkered iron plate, creating a characteristic pattern.