These hard candies are traditionally flavoured with a hint of salt, echoing the salt-marsh coastline of Zeeland where they've long been sold to seaside visitors.
Sugar and butter are boiled to a hard, chewy stage, sometimes with a hint of salt or aniseed, then cooled and cracked into individually wrapped candies. Seaside stalls and sweet shops around Zeeland's coastal towns sell them in twisted paper bags to holidaymakers.