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Basically, a rum and coke with a squeeze of lime, but Cuba Libre has much more of a ring about it. Zesty lime and dashes of bitters add layers of complexity...
From all the research I have done, I have never, ever, seen a Cuba Libre recipe which calls for Angostura, and generally, the proportions for rum to coke are more towards 1:3 (according to the International Bartender's Association, it's 5cl rum and 12cl coke) but of course, this is a matter of preference. Also, there is no muddling in a cuba libre, you just add 1cl of lime juice.
Now, I don't know who adds these recipes, but why is Angostura listed?
I'd venture to say it's to further cut the sweetness of the cocktail in general, and to hew towards the standard that says it's only a mixed drink w/o the bitters, i.e. not a cocktail, strictly speaking.
Yes, the classic recipe calls for just "Rum, Cola and Lime". But a single dash of Angostura bitters adds a much welcome layer of complexity to it if using light rum. Though I don't find it particularly necessary if using Havana Club Especial or Bacardi 4 aƱos for example.
Now, I don't know who adds these recipes, but why is Angostura listed?