The combination of lime and berries is one that sings. Black raspberries are a treat, though raspberries or blackberries would work just as well. When stone fruit is abundant, plums or peaches would be brilliant. Onto that muddle, in goes a pour of vodka, ice, then bubbles of your choosing – sparkling water, or something stronger – and finally, a spoonful of sherbet to float atop. Altogether, it is a rather delightful blend of a Moscow Mule, nimbu pani and those effervescent punches made with sherbet and lemon-lime soda. In other words, summer in a glass.