2.92 oz mixed with ice, 0.94 oz of it pure alcohol
Melt
Stirred: +15 % of the pre-batch, +0.44 oz of water
Served
2.92 + 0.44 = 3.36 oz in the glass
Strength
0.94 ÷ 3.36 = 27.8 % ABV as served
Ethanol
0.94 oz × 29.57 ml × 0.789 g/ml = 22 g · about 153 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.
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.
The bitter from gentian root, used across Campari, Aperol, sweet vermouth, Angostura, and most amari. Bitter compounds activate TAS2R taste receptors that evolved to detect plant alkaloids. The same machinery that makes broccoli taste bad to children also makes a Negroni taste like an adult ordered it.
White rum, dry vermouth, orange curaçao and grenadine. The 'president' of pre-revolution Cuban cocktails is a stirred, Manhattan-template rum drink named for a Cuban president: Mario García Menocal or Gerardo Machado, by rival accounts. It carries d-limonene from the curaçao, gentianin from the dry vermouth and ethyl esters from the rum.
PROVENANCE
Often credited to the Vista Alegre bar in Havana and named, by rival accounts, for President Mario García Menocal (1913–1921) or Gerardo Machado (1925–1933). Machado's regime ended in revolution; the cocktail outlasted both. Constante Ribalaigua's 1934 Floridita Cocktail Book printed the canonical recipe. The dry vermouth + grenadine combination is what distinguishes it from the rum-Manhattan variants: restrained sweetness with a fruit-floral middle.
