Tonic is a slightly bitter carbonated water typically used in cocktails. Tonic has become more popular in iced coffee and iced espresso drinks. Businesses like San Francisco’s Saint Frank Coffee, which is the first place I tried the combo, make tonic shine.

Emma’s Coffee is a new West Hollywood specialty coffee bar located across from Largo named for the owner’s rescue dog. She apparently found Emma behind a coffeehouse dumpster. The quaint cafe contains grey walls, just six tables, and counter seats. A cream colored two-group La Marzocco espresso machine, Amavida Coffee Roasters beans and tonic water tag team on a surprisingly refreshing Iced Espresso Tonic ($4). At Emma’s Coffee, a double shot of cascading espresso joins effervescent tonic water in an Old Fashioned glass with a tangy lime twist, forming a punchy summer sipper.