Back in 2014 The Doc got together Yeastie Boys to create a beer with the Wheaty Brewing Corps in Adelaide. The inspiration for Tonic was gin and tonic and they quickly decided to incorporate cinchona bark as a bittering agent instead of hops. The cinchona makes for a very dry beer and, as there are no hops, it is actually a Gruit. Tonic also incorporates orange peel, juniper berries, lemon myrtle and coriander to make for a real gin, tonic and witbier mash-up. It can be drunk 'straight' or paired with gin. The Doc recommends blending Tonic with a shot of a citrus forward gin and sliver of cucumber.