0.77 oz × 29.57 ml × 0.789 g/ml = 18 g · about 126 kcal from the alcohol alone
IN THE GLASS
α-PINENE
FROM GIN
Formula
C₁₀H₁₆
Mass
136.24 g/mol
IUPAC
2,6,6-trimethylbicyclo[3.1.1]hept-2-ene
The pine note in juniper berries, and the reason gin tastes like a forest. Co-distilled with the spirit during production. Found in actual pine trees, rosemary, basil, and a good London Dry. The "Christmas tree" smell of gin and the smell of a forest floor share a single molecule.
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.
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.
Gin, two vermouths and orange juice. It uses the half-and-half vermouth format with fresh orange juice. D-limonene from orange bridges juniper and vermouth herbs.
PROVENANCE
Johnnie Solon, head bartender at the Old Waldorf Astoria, is credited with creating the Bronx in the early 1900s, though an 1895 hotel wine list already names a Bronx Cocktail. By his own account he named it for the unfamiliar beasts of a recent Bronx Zoo visit; the cocktail was his answer to a head waiter whose customer doubted he could invent a new one. The Bronx was wildly popular pre-Prohibition, and still ranked third, behind the Martini and Manhattan, in a 1934 list of famous cocktails; it faded from that position later.