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FWIW, the Becherovka website (https://www.becherovka.com/en/cocktails/original-beton/) uses 40 ml Becherovka & 100 ml Tonic, so that would be 150 ml Tonic for 60 ml Becherovka... They're also using lemon for the garnish, instead of lime, and they claim that this *is* the Czech national cocktail.