Cold Brew Coffee Syrup
A sweetened cold brew syrup that delivers espresso-strength coffee flavor with sugar built in — designed for Espresso Martinis, iced cocktails, and dessert drinks.
Cold brew coffee syrup combines two of the most useful bar preparations into one shelf-stable bottle: cold brew concentrate and simple syrup. The slow steep of coarse-ground coffee in cold water yields a smoother, less acidic extraction than hot brewing, and the integrated sweetener makes the syrup pour-and-mix simple for cocktail service. A half-ounce delivers both the coffee character and the sweetness needed for a balanced Espresso Martini, Black Russian, or White Russian without requiring a separate measure of simple syrup.
- 4 ouncescoffee beans(coarse-ground; medium-dark roast preferred)
- 4 cupswater(filtered, room temperature)
- 2 cupssugar(granulated or raw)
- 1Combine the coarse-ground coffee with two cups of the water in a large container, stirring until all the coffee grounds are fully wet, then let stand for thirty minutes to allow the grounds to bloom.
- 2Add the remaining two cups of water and stir briefly to combine, then cover the container and let it steep at room temperature for twenty-four hours.
- 3Strain the cold brew through a fine mesh strainer first to remove the bulk of the grounds, then strain again through a coffee filter or cheesecloth-lined funnel to clarify the liquid.
- 4Pour the clarified cold brew into a clean saucepan and warm it over low heat just until comfortably hot, without bringing it to a boil.
- 5Add the sugar to the warm cold brew and stir for one to two minutes until the sugar fully dissolves into a uniform syrup.
- 6Let the syrup cool to room temperature in the pan, which takes about twenty minutes.
- 7Transfer the cooled syrup to a clean glass bottle using a funnel, then seal and refrigerate. To use in cocktails, measure half to three-quarters of an ounce per Espresso Martini in place of both the coffee and the sweetener.
Store in a sealed glass container in the refrigerator for up to one month. The syrup should retain its dark amber color and rich coffee aroma; discard if any cloudiness, fermentation bubbles, or sour smell develops. The high sugar concentration extends shelf life beyond plain cold brew, which lasts only about two weeks. For longer storage of up to two months, add one tablespoon of vodka or another high-proof neutral spirit before bottling. Keep refrigerated.
Use coarse-ground coffee — fine grinds will over-extract and create bitter sediment that is difficult to filter out. A burr grinder set to French press grind is ideal; a blade grinder produces uneven grounds that include too much fine dust. The twenty-four-hour steep is a sweet spot — shorter steeps yield weaker brew, longer steeps add bitter and woody notes from over-extraction. A medium-dark roast like a Colombian or Brazilian works best because lighter roasts can taste sour when cold-brewed. Filter the brew at least twice through fine mesh and then a coffee filter; sediment in the finished syrup is the most common quality issue. Adding the sugar to warm rather than hot cold brew prevents the dissolution from picking up any cooked flavor. For Espresso Martinis, a three-quarter ounce pour of this syrup delivers the same caffeine punch as a full one-ounce shot of espresso plus a half-ounce of simple syrup.
Cold brew coffee as a brewing method dates back centuries — the Kyoto-style slow-drip cold brew has been practiced in Japan since the 1600s. The modern American cold brew movement gained mainstream traction starting around 2010 through coffee shops like Stumptown and brands like Chameleon, and craft bartenders quickly began incorporating it into cocktails because cold brew avoids the over-extraction and rapid temperature shock that comes from pouring hot espresso into a chilled cocktail. Jeffrey Morgenthaler at Clyde Common in Portland was an early advocate for cold brew in Espresso Martinis, publishing his concentrate-based version on his blog and demonstrating the technique in a competition that placed third in PUNCH Magazine's Espresso Martini tasting. The original Espresso Martini itself was created in the late 1980s in London by Dick Bradsell for a famous model who reportedly asked for a drink that would wake her up.
For a vanilla cold brew syrup ideal in iced lattes and Espresso Martinis, split a vanilla bean and steep it with the coffee for the full twenty-four hours, then remove before sweetening. A spiced cold brew syrup steeped with two cinnamon sticks, three cardamom pods, and a star anise becomes the perfect base for fall and winter coffee cocktails. For a more decadent dessert syrup, replace half the sugar with brown sugar or demerara sugar, which adds molasses depth that pairs beautifully with whiskey and rum. A chocolate cold brew syrup made by stirring two tablespoons of cocoa powder into the warm brew before sweetening is excellent in mocha cocktails. For a low-sugar version, use a one-to-one ratio of cold brew to sugar instead of two-to-one, but reduce shelf life to about two weeks.
No common allergens. Naturally vegan and gluten-free. Coffee contains caffeine — about 100mg per ounce of finished syrup, depending on bean variety and steep length. Not suitable for caffeine-sensitive guests or evening service for those who avoid stimulants late in the day.