This undated image shows Mezcal Negroni cocktail from Hacha Brixton in London. Bar manager Ben Guillou serves up a Mezcal Negroni, a drink traditionally made with a London dry gin, Campari and vermouth, but he swaps out the gin for mezcal. (AP Photo/Louise Dixon)
This undated image shows a Mezcal Espresso Martini cocktail from El Bar de Cavita in London. Chef patron Adriana Cavita feels the mezcal brings a lot of flavor and complexity to the classic vodka cocktail. (AP Photo/Louise Dixon)
This undated image shows a Maestro Old Fashioned cocktail from Mezcalito Brompton bar in London. Co-founder Oliver Castilla-Tristan does a twist on the classic Old Fashioned recipe of whiskey, sugar, angostura bitters and water. using anejo tequila, which is aged tequila. We use a bit of cacao liqueur. (AP Photo/Louise Dixon)
This undated image shows a Nightingale cocktail from Swift Shoreditch bar in London. Co-founder Bobby Hiddleston uses a reposado tequila (aged 2 months to 1 year in oak barrels). He says you can't keep it as dry as you would a gin or vodka martini, and the key is to bolster the sweetness by using a blanco vermouth rather than a dry vermouth. (AP Photo/Louise Dixon)
This undated image shows a tomato bamboo cocktail from Amaro bar in London. Traditionally a lower strength drink made with sherry and two types of vermouth, this recipe switches a vermouth for a mezcal, retaining the dry taste but adding a smoky herbal touch. (AP Photo/Louise Dixon)