0.95 oz × 29.57 ml × 0.789 g/ml = 22 g · about 155 kcal from the alcohol alone
IN THE GLASS
VANILLIN
FROM AGED RUM · from oak barrel aging
Formula
C₈H₈O₃
Mass
152.15 g/mol
IUPAC
4-hydroxy-3-methoxybenzaldehyde
Bourbon's fingerprint, extracted from the charred American oak the law requires for aging. Same molecule as the vanilla bean's signature, so a well-aged bourbon legitimately tastes like vanilla. Chemistry, not metaphor. Cognac, aged rum, tequila reposado all extract vanillin from oak too. Different barrels, same molecule.
An orange rind, squeezed, throws a spray that catches the light. That's d-limonene boiling off. It's roughly 95% of orange peel oil by mass, and the molecule that puts the "orange" in orange anything. Used industrially as a green solvent because the chemistry that dissolves citrus oils also dissolves greasy machinery. The expressed-peel garnish on a cocktail is delivering vaporized limonene to the rim of the glass.
Lemon's defining note: technically a mix of two geometric isomers (geranial and neral) that read as the same aroma to the nose. Lemon peel, lemongrass, lemon verbena, and Indian chai all carry it. In cocktails it's what a lemon twist contributes that lemon juice can't: the volatile expressed from the oil glands, not the acid from the pulp.
Aged rum and white rum with orange curaçao, lime and orgeat. Vanillin comes from the barrel, d-limonene from the curaçao and citral from the lime. Orgeat's almond and orange-flower notes soften a high-ABV backbone that hides behind the fruit.
PROVENANCE
Bergeron built it for two Tahitian friends visiting his restaurant from a 17-year-old J. Wray & Nephew rum. The first taster reportedly said 'Maita'i roa ae', Tahitian for 'out of this world, the best.' The original used aged Jamaican rum, orgeat, orange curaçao, fresh lime; the post-war coconut-and-pineapple tiki variations are not Bergeron's recipe.
