Fresh Lime Cordial

Store in a sealed glass bottle in the refrigerator for up to six weeks. The vivid green color will fade to yellow-green over time — this is normal and does not affect flavor. Discard if fermentation bubbles develop. Keep refrigerated.

Persian limes — the common supermarket variety — are juicier and more acidic than Key limes and produce a sharper, cleaner cordial; Key limes produce a more aromatic, floral cordial with greater complexity if you can source them. Add lime juice off the heat after the syrup has cooled slightly to preserve the volatile aromatic compounds that make fresh lime distinctive — these dissipate quickly if juice meets boiling syrup. For a cordial closer to the classic Gimlet benchmark, reduce the sugar slightly for a less sweet, more tart result that requires less adjustment in the shaker. Citric acid is optional but extends shelf life significantly and adds authentic brightness.

Lime cordial has a precise and well-documented origin in British maritime history. Lauchlan Rose, a Scottish ships' chandler, patented a method for preserving lime juice without alcohol in 1867 — the resulting product, Rose's Lime Cordial, was adopted to fulfill the Merchant Shipping Act requirement that Royal Navy ships carry anti-scurvy citrus rations. The Gimlet cocktail emerged from this naval context, combining lime cordial with gin; the preparation was documented by Rear-Admiral Desmond Gimlette around 1900 as an officer's medicinal drink. Raymond Chandler's 1953 novel The Long Goodbye cemented the drink's cultural identity when Philip Marlowe declared that a real Gimlet is made of half gin and half Rose's Lime Juice. Homemade lime cordial made with fresh juice and zest is preferred by craft bartenders for the modern Gimlet and countless other cocktails for its brighter, more aromatic character.

For a Key lime cordial with a more aromatic, floral character, substitute small Key limes — approximately sixteen to eighteen will yield the same amount as eight Persian limes. A lime-ginger cordial can be made by adding a one-inch knob of fresh ginger, thinly sliced, to the sugar syrup during heating, producing a sharp, warming variation suited to Moscow Mule-style cocktails. A lime-coconut cordial suited to tiki drinks can be made by replacing half the water with unsweetened coconut water.

No common top-eight allergens. Naturally vegan and gluten-free. Citrus allergies are rare; individuals with oral allergy syndrome may experience mild reactions to concentrated citrus preparations.