Every year on 21 February, bonfires are lit all along Schleswig-Holstein's North Sea coast . – on the mainland, the islands and the Hallig islets – to drive away the winter in accordance with an ancient Frisian custom. There's much singing, dancing and drinking, then once the fires have died down, everyone heads to the inns and taverns to celebrate with a meal of curly kale, which may not be an ancient custom – but is definitely warming and delicious!