Surprised by the results and curious to test other white rums now... Vanilla syrup: 2.5 vanilla extract, 12.5 2:1 cane simple (turned out good). Rum: Plantation 3 Stars. 2 drops saline... I can see this being better with Bacardi... Made it a second time with Clement Rhum 40% - too dominant, balance thrown way off, but still more than palatable... Always up for trying cocktails with cardamom, and the measure here is spot on.