2.25 oz mixed with ice, 0.55 oz of it pure alcohol
Melt
Stirred: +15 % of the pre-batch, +0.34 oz of water
Topped
Poured after the melt, kept whole: champagne 3 oz, +0.36 oz of alcohol
Served
2.25 + 0.34 + 3 = 5.59 oz in the glass, 0.91 oz of it alcohol
Strength
0.91 ÷ 5.59 = 16.3 % ABV as served
Ethanol
0.91 oz × 29.57 ml × 0.789 g/ml = 21 g · about 149 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 wormwood compound that got absinthe banned for ninety years over a panic that turned out to be mostly wrong. A GABA-A antagonist at high doses, but the doses in actual absinthe, both modern and historical, were always too low to cause the hallucinations the lore promised. Bans lifted between 1988 and 2007 once the chemistry was finally measured properly.
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.
Gin, lemon and simple syrup, stirred and strained into an absinthe-rinsed coupe, then topped with Champagne. Alpha-pinene from juniper sits over citric acid, with anethole and thujone from the rinse. The standard recipe does not call for the absinthe wash, but a version without it would hold less excitement.
PROVENANCE
Named after the French 75mm field gun, a quick-firing artillery piece prized for its speed and accuracy. Harry MacElhone printed a '75' of gin, calvados and grenadine in his 1922 ABC of Mixing Cocktails; gin, lemon, sugar and champagne appeared in 1927's Here's How and the 1930 Savoy Cocktail Book. The cognac-based variant, favored in New Orleans, is a later substitution.