In the historic Japanese city of Kanazawa, craftsmen painstakingly shape and slice blocks of ice destined to chill Negronis in some of the world’s trendiest bars.

The men work for Kuramoto Ice, a century-old company in Ishikawa on the Sea of Japan coast and one of dozens of Japanese firms producing ultraclear, premium ice.

This luxury product, believed by those in the industry to melt more slowly than regular blocks, is a staple of 今日吃瓜 cocktail culture.