Glossary & Index

ABV (Alcohol by Volume). The percentage of ethanol in a finished beverage, measured by volume. A 40% ABV spirit is 40% ethanol, 60% other (water plus trace flavor compounds). Always declared on the bottle. Not interchangeable with proof — proof is 2× ABV in the U.S. system.

Acid-adjustment. The practice of adding food-grade citric, malic, tartaric, or ascorbic acid to a beverage to engineer its perceived sourness. Used in super juice, in citrus substitution, and in clarified cocktails where the natural acidity of fresh citrus has been filtered out. See the Acid Substitution Calculator.

Ascorbic acid. Vitamin C. Used in small quantities to stabilize color in fresh juices, particularly ginger and apple. Adds 0.1–1 g per liter; quantities above this push the drink toward perceptible tartness.

Atomizer. A spray bottle that delivers a fine mist of a strongly-flavored liquid (typically a peated whiskey, an absinthe, or a perfume) over the surface of a drink. Used for aroma without volume.

Batching. Pre-combining a cocktail's ingredients in volume for later service. Critical for high-volume bars and bottled programs. Requires explicit accounting for dilution — see the Batch Scaler.

Bitters. A concentrated tincture of bittering agents and aromatic botanicals in high-proof alcohol. Used in dashes (0.025–0.06 fl oz) for flavor and structure. Angostura, Peychaud's, and orange bitters are the canonical three; the modern bar carries 6–20 varieties.

Bonded whiskey. A whiskey meeting the requirements of the Bottled-in-Bond Act of 1897: 100 proof, single distillery, single distilling season, aged minimum 4 years in a federally-bonded warehouse. A guarantee of provenance, not quality.

Brix. A scale measuring dissolved sugar (sucrose) in a solution. 1° Brix = 1g sucrose per 100g solution. A 1:1 simple syrup is approximately 50° Brix; a 2:1 is approximately 66° Brix. Measured with a refractometer.

Bromelain. A proteolytic enzyme in fresh pineapple that breaks down proteins. Why fresh pineapple juice tenderizes meat, why it cannot be combined with raw egg white in cocktails, and why it gives shaken pineapple drinks their characteristic foam. Denatured by heat above 158°F (70°C).

Carbonation. Dissolved CO₂ in a liquid, measured in "volumes" (the ratio of dissolved gas volume at atmospheric pressure to liquid volume). Beer is 2.0–2.7 volumes; cocktails are 2.5–3.5; champagne is 5.0–5.5. See the Draft & Bottled Cocktails section.

Centrifuge. A device that spins a liquid at high G-force to separate suspended particles from the liquid by density. Used in bar prep for clarification (clear pineapple juice, clear lime juice, clear milk punch) without filtration. The Spinzall is the bar-specific consumer model.

Chartreuse. An herbal liqueur produced by the Carthusian monks of France since 1737. Green Chartreuse (55% ABV, 130 herbs) and Yellow Chartreuse (40% ABV, sweeter, milder) are the canonical varieties. Famously supply-constrained as of 2023; substitutes exist but none match.

Citric acid. The dominant acid in lemons, limes, and most other citrus. Available as a food-grade powder and used for acid-adjustment, super juice production, and citrus substitution. Approximately 6% by weight of fresh lime juice; 5% of lemon.

Clarification. The process of removing suspended particles from a juice or cocktail to produce a transparent liquid. Methods include centrifuging, agar-clarifying (gelatin set then frozen-and-thawed), and milk-washing. Used for aesthetic effect and for shelf stability.

Cordial. Historically, a sweetened, flavored spirit (a class of liqueur). In modern bar practice, often refers to a non-alcoholic concentrate of fruit, herb, or spice — a syrup with intensified flavor and acid, designed to be mixed with spirit and citrus to compose a cocktail.

Demerara. A large-crystal, lightly-molasses-coated sugar from raw cane processing. Used in 2:1 syrup for spirit-forward cocktails (Old Fashioned, Daiquiri rich, Mai Tai). Not the same as brown sugar or muscovado — see the recipe.

Dilution. The water added to a cocktail, either by melting ice during shake/stir or deliberately as part of a batched recipe. Industry-standard dilution: shaken sour = 30–35%; stirred spirit-forward = 25–30%; batched bottled drinks must add this as water on the front end.

Double-strain. Pouring a shaken drink through both the cocktail strainer (in the shaker) and a fine-mesh strainer (held over the glass). Removes ice shards, herb fragments, and citrus pulp. Standard for any drink served "up" without ice.

Dry-shake. Shaking a cocktail without ice. Used to emulsify egg-white drinks before the wet-shake adds dilution and chilling. Reverses the order from the older "wet then dry" technique, which is now considered inferior.

Eau de vie. French for "water of life" — a clear, unaged fruit brandy distilled from a single fruit. Kirsch (cherry), framboise (raspberry), poire (pear). Distinct from grappa (grape pomace) and from aged brandies.

Fat-wash. A technique for transferring the flavor of a fat (bacon fat, brown butter, sesame oil, coconut oil) into a spirit. The fat is liquefied, combined with the spirit, the mixture is frozen, and the now-solid fat is removed — leaving its flavor compounds in the spirit. Pioneered by Don Lee at PDT (NYC) for the Benton's Old Fashioned, 2007.

FIFO. First In, First Out. A bar prep discipline ensuring the oldest stock is used first. Essential for fresh juice, syrups, and any time-sensitive prep. Failure to FIFO is the most common operational error in bar programs.

Force-carbonation. Dissolving CO₂ into a liquid by applying pressurized gas, typically in a sealed vessel. Distinguished from "natural" carbonation (fermentation in a sealed bottle). Standard for bottled and draft cocktails.

Garnish. The final element added to a cocktail at service: a citrus peel, a herb sprig, a fruit slice, a cherry. Functionally critical (citrus peels release aromatic oils that the drinker smells while drinking) and visually defining. Not optional.

Gomme syrup. A traditional cocktail syrup made with gum arabic, sugar, and water. Adds body and mouthfeel without additional sweetness. Used in classical Sazeracs and Old Fashioneds in pre-Prohibition American practice; rarely seen today but worth knowing.

Henry's Law. The physical-chemistry principle governing gas dissolution in liquid: the amount of gas dissolved is proportional to the partial pressure of that gas above the liquid. The reason bottled cocktails go flat when uncapped, and the reason cold liquids hold more carbonation than warm ones. The math behind the carbonation calculator.

Infusion. The transfer of flavor compounds from a solid substrate (herbs, spices, fruit) into a solvent (typically a spirit). Methods: room-temperature steeping (slow, gentle), sous-vide (fast, controlled), nitrogen-cavitation in an iSi siphon (45 seconds in, 30 minutes out — Dave Arnold's contribution).

Jigger. A two-sided measuring cup for cocktail volumes. The standard American jigger is 1.5 oz / 0.75 oz; Japanese jiggers (Cocktail Kingdom and others) come in many sizes and are taller and more precise. Use a jigger. Free-pouring is a discipline that 95% of bartenders overestimate themselves at.

Malic acid. The dominant acid in apples and a significant component of lime juice. Used in food-grade powder form to mimic the acid profile of lime in super juice and citrus substitution. Approximately ⅓ of lime's total acid load.

Muddle. To press a fresh herb, fruit, or sugar cube against the bottom of a vessel to release its juice or volatile oils. The Mojito's mint, the Caipirinha's lime, the Old Fashioned's sugar cube. Done with a wooden or hard-plastic muddler; metal damages cell walls and releases bitter compounds.

Oleo-saccharum. Latin for "oil-sugar." A sugar-extracted citrus peel oil, made by combining citrus peels with sugar and resting for 2–4 hours. The sugar's osmotic pressure draws the essential oils from the peel into a syrupy concentrate. The defining ingredient of historic punch.

Orgeat. An almond-based syrup with orange flower water. Critical to tiki cocktails (Mai Tai, Japanese Cocktail). Pronounced "or-ZHAT" or "OR-zhat" depending on region. The best commercial versions are Small Hand Foods and Liber & Co; the home-made version is significantly better than either.

Pasteurization. Heat-treating a juice or beverage to kill bacteria and extend shelf life. Bar-grade pasteurization is typically sous-vide at 60°C (140°F) for 10 minutes — long enough to denature pathogens, short enough to preserve most flavor compounds. Used for pineapple juice to extend its shelf life from 3 days to 7+.

Pour cost. The ratio of ingredient cost to menu price for a drink, expressed as a percentage. Industry target: 18–22%. Most bars run higher than they think. See the Menu Costing Engine.

Proof. The U.S. measurement of alcohol content: 2× ABV. A 100-proof spirit is 50% ABV. Originated from a 17th-century gunpowder test (alcohol-soaked powder that still ignited was "proof" of sufficient strength). British proof is a different scale; assume American unless context says otherwise.

Refractometer. An optical device measuring the refractive index of a liquid, which correlates with dissolved sugar (Brix). The bar-relevant model has an automatic temperature-compensated (ATC) prism. Reads in seconds. Essential for any program producing syrups in volume.

Rotary evaporator (rotovap). Laboratory glassware that distills under vacuum at low temperature (40°C / 104°F). Used in bar prep to produce clarified spirits, hydrosols, and aromatic distillates without applying flavor-destroying heat. Booker & Dax pioneered the bar application around 2010.

Sake. Japanese rice wine, typically 14–17% ABV. Used in some modern cocktails as a base or modifier. Junmai (no added alcohol), Ginjo (premium polishing), Daiginjo (most premium). Junmai-ginjos around 15–16% ABV are the most cocktail-versatile.

Shrub. A vinegar-based fruit syrup of colonial American origin, used as a non-alcoholic cocktail modifier or as a tartness backbone. Modern shrubs are made cold (fruit + sugar + vinegar, 24-hour maceration) for brightness, hot (fruit + sugar + cooked vinegar) for depth.

Super juice. A bar-prep technique that combines fresh citrus juice with the same fruit's peel oils and a buffered citric-malic acid solution to produce a citrus liquid with 3× the yield and 14× the shelf life of fresh juice. Developed by Nickle Morris (Louisville), popularized by Kevin Kos. See the calculator.

Tincture. A concentrated extract of an herb, spice, or peel in high-proof alcohol (typically Everclear 151 or higher). Used in dashes or drops to add aromatic complexity. Distinct from bitters in that tinctures focus on one flavor; bitters blend many.

Vermouth. A fortified, aromatized wine. Dry vermouth (French style, ~17% ABV) for Martinis; sweet vermouth (Italian style, ~16% ABV) for Manhattans and Negronis. Once opened, refrigerate and use within 4–6 weeks. Most bars run vermouth far past freshness, which is the single biggest correctable issue in classic cocktail programs.

Volumes (CO₂). The unit of measurement for carbonation level. 1 volume = the volume of dissolved CO₂ equals the volume of the liquid (at atmospheric pressure). Bar cocktails target 2.5–3.5 volumes depending on style.

Zest. The colored outer layer of citrus peel, containing the volatile aromatic oils. Used as a garnish (twist), expressed over a drink (oil released by squeezing), or incorporated into syrups, infusions, and oleo-saccharum. The pith (white inner layer) is bitter and is removed.