Hello. While it might seem unorthodox to traditionalists, the Kalimotxo is actually a classic beverage originating from the Basque Country. The traditional and proper proportion is a strict 1:1 ratio, meaning equal parts red wine and Coca-Cola. It is typically served cold over ice cubes in a tall glass. While cheap, young red wine is standard, the sweetness of the cola balances the tannins of the wine, creating a surprisingly refreshing mix.