British India, mid-1800s.
| 2 oz · 60 ml | GIN | 40 % |
| 4 oz · 120 ml | TONIC WATER |
1 oz taken as 30 ml in the metric column.
1 oz taken as 30 ml in the metric column.
| Pre-batch | 2 oz mixed with ice, 0.8 oz of it pure alcohol |
|---|---|
| Melt | Built in the glass: +5 % of the pre-batch, +0.1 oz of water |
| Topped | Poured after the melt, kept whole: tonic water 4 oz, no alcohol |
| Served | 2 + 0.1 + 4 = 6.1 oz in the glass, 0.8 oz of it alcohol |
| Strength | 0.8 ÷ 6.1 = 13.1 % ABV as served |
| Ethanol | 0.8 oz × 29.57 ml × 0.789 g/ml = 19 g · about 131 kcal from the alcohol alone |
FROM GIN
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.
FROM TONIC · the bitter in tonic
The cinchona-bark alkaloid that defines tonic water, bitter enough that a few milligrams per liter is all the recipe needs. Used as the original anti-malarial before synthetic replacements; gin & tonic exists because British colonial officers in 19th-century India needed a daily quinine vehicle, and gin made the tonic less unpalatable. Modern tonic carries a fraction of the historical dose.
ALSO IN Greyhound · Paloma · White Negroni
FROM LIME · citrus peel oil
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.
ALSO IN Old Fashioned · Martini · Margarita · Cosmopolitan · Mai Tai · Piña Colada · Hemingway Daiquiri · Americano
Gin, tonic and a lime wedge. Quinine, the bitter alkaloid that once made tonic medicinal, anchors the structure, and alpha-pinene carries the juniper. Carbonation lifts the aromatics; the botanicals do the rest of the work.
Quinine, sourced from cinchona bark, was the standard malaria prophylaxis of the 19th century. British officers in India took it in sweetened soda water, the first tonic; gin and lime softened the bitterness further. Schweppes sold Indian Tonic Water from 1870, and the pairing spread well beyond the colonies.
