Muddle the mint leaves in a glass with the sugar & lime juice to extract the mint oils. Fill the Tumbler glass with crushed ice and add the rum and Angostura, then top up with soda water and stir.
Garnish: Mint sprig
Liquid volume = 190ml, ABV = 14.1%
P.S.
You can, of course, use fresh limes instead of lime juice :)
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