This article first appeared in the Drinks International Global Bar Edition which can be read in full here At Mondhügel Bar, craft bartending goes deeper. Owners Benito Opitz and Philipp Schmitz do not only serve local German products – they make them themselves. They’ve created their own gin, Kreuzberg, and for their Barrel Aged Negroni, they make a homemade bitter from cinchona bark and simulate ageing through…