0.64 oz × 29.57 ml × 0.789 g/ml = 15 g · about 105 kcal from the alcohol alone
IN THE GLASS
VANILLIN
FROM COGNAC · 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.
Chocolate's stimulant: cocoa's signature alkaloid, structurally similar to caffeine but with a longer half-life and a gentler peak. The mood-lift from dark chocolate is partly theobromine and partly the phenylethylamine that comes with it. Toxic to dogs because the canine liver clears it ~10x slower than the human liver. Same molecule, lethal at chocolate doses a person finds mild.
The rose aroma: exactly the molecule that gives rose petals their scent, and one that yeast produces during slow fermentation. Mead, sweet wines, and certain Belgian ales carry it; a sherry that smells of honey and roses is leaning on phenylethanol. Industrial perfumery uses synthesized 2-PE because rose absolute costs more than gold by weight.
Cognac, brown crème de cacao and cream. Theobromine from cacao, vanillin from Cognac and lipid-dense cream make up the chemistry. The texture, the way it coats the glass and the palate, is the whole point. Nutmeg's myristicin finishes.
PROVENANCE
The gin-based 'Alexander Cocktail', from which the brandy variant descended, first appears in print in Hugo Ensslin's 1916 Recipes for Mixed Drinks in New York; the brandy version followed in 1920s cocktail books. John Lennon reportedly developed a serious habit during the 1973-75 'Lost Weekend' separation from Yoko Ono. The drink's reputation has alternated between sophisticated and embarrassing through the 20th century; currently rehabilitated in serious bars.