The martini is back on trend as bars from New York to London shake up the classic cocktail

Walk into a New York bar or restaurant, and there is one drink you are guaranteed to see on the menu: a martini. Often, there will be several – a classic with a twist, one so dirty it is cloudy, and one served sub-zero and cold as ice. You will see a similar picture in cities like London and Los Angeles. Despite the well-documented fact that people are drinking less than they used to, the alcohol-heavy martini is getting star billing everywhere. A well-made martini – gin or vodka, mixed with a...