Staying on the track of Doug's Tiki Month vibe, I bring you yet another tinkering.
Bora Bora Punch
¾ oz fresh lime juice 1 oz fresh grapefruit juice
½ oz cinnamon syrup
½ oz 2:1 sugar syrup (Demerara sugar is a nice variation)
½ oz Demerara rum (El Dorado 5 or 8) 1½ oz aged Haitian rum (Barbancourt 8 or 15)
Put all the ingredients into a cocktail shaker with crushed ice. Shake furiously. Pour into a chimney glass, top with more crushed ice to fill.