Trinidad sour
The Trinidad Sour is an IBA official cocktail. Unusually for a cocktail, it uses Angostura bitters as its base spirit rather than merely as a flavoring agent. The bitters are the single largest component of the drink, in its IBA formulation. The Trinidad Sour was introduced in a 2009 competition by Giuseppe Gonzalez, but despite its bold flavors, it was a complete flop, failing to even make the competition's top ten. Over time, however, the drink gained popularity and has earned since its place as a modern classic.
Text from Wikipedia, CC BY-SA 4.0

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