Stirred: +15 % of the pre-batch, +0.52 oz of water
Topped
Poured after the melt, kept whole: soda water 3 oz, no alcohol
Served
3.5 + 0.52 + 3 = 7.02 oz in the glass, 0.8 oz of it alcohol
Strength
0.8 ÷ 7.02 = 11.4 % ABV as served
Ethanol
0.8 oz × 29.57 ml × 0.789 g/ml = 19 g · about 131 kcal from the alcohol alone
IN THE GLASS
DIACETYL
FROM WHITE RUM CANE · the butter note
Formula
C₄H₆O₂
Mass
86.09 g/mol
IUPAC
butane-2,3-dione
The butter note. Wanted in oak-aged Chardonnay and certain ales (English bitter, Czech pilsner) where a controlled amount adds body; unwanted at high concentrations, where it slides into movie-theater-popcorn territory. Yeast produces it as an intermediate during fermentation and reabsorbs it during conditioning. A rushed beer that skipped its conditioning rest often carries diacetyl as an off-flavor the brewer didn't intend.
A cyclic alcohol that hijacks TRPM8, the same cold-sensing receptor that fires when the skin actually hits a cool surface. The "cooling" sensation is neurological, not thermal; the drink isn't cold, the nerves just think it is. Peppermint carries the most; a mojito gets a fraction of the real thing from muddled mint leaves. Same chemistry powers menthol cigarettes, cough drops, and the post-shave aftershock of anything labeled "icy."
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.
A Mojito built precisely with white rum only, the Cuban purist variant. There is no dark rum, and no lime in the muddle: mint and syrup only, with the lime added as juice. The notes are carvone, citral, ethyl esters and CO₂.
PROVENANCE
La Bodeguita del Medio (Hemingway's other Havana haunt) serves what most accept as the canonical Mojito. The 'blanco' designation distinguishes it from the various Mojito variations that have accumulated since. La Bodeguita's recipe presses the mint gently with sugar and fresh lime juice rather than shredding it, a subtle but meaningful technique difference. The 'my mojito in La Bodeguita' line on its wall is credited to Hemingway, though its authenticity is doubted.
