Crack, by German designer Julian Appelius, is a ceramic breadknife and cucumber grater for the preparation of England’s traditional tea sandwich.

The flexible ceramic knife must be broken from its housing – perforations along the line of fracture act to form the wavy knife blade. This reveals a second blade in the remaining form that you use for slicing cucumber. The strength of high-tech ceramics is playfully demonstrated by the necessity to break the product before it is used.

The perfect host will serve the sandwiches with tea poured in proper mugs.