Casper the Ghost

What is Casper the Ghost?

The Casper the Ghost cocktail is a Halloween-themed tequila sour built around the visual concept of a ghostly white foam layer — the egg white top that gives the drink its name and its signature ethereal appearance. It belongs to the family of egg white sours that have a history stretching back to the late 19th century, when bartenders first began using raw egg white to add texture and a silky foam to spirit-and-citrus drinks. The technique fell largely out of fashion through the mid-20th century due to changing hygiene standards, before being enthusiastically revived by the craft cocktail movement of the 2000s and 2010s, which recognised egg white as an essential textural tool rather than a gimmick. Using reposado tequila rather than blanco as the base is a deliberate choice that elevates the drink above a standard agave sour — reposado's time in oak barrels adds a subtle vanilla and caramel warmth that complements orgeat's almond sweetness in a way that unaged tequila cannot. The name and Halloween positioning make this one of the more searchable seasonal cocktails on the calendar, with peak interest running from mid-September through October.

If you enjoy cocktails with texture and depth, this drink sits somewhere between a classic sour and a modern craft cocktail. The reposado tequila brings gentle oak and vanilla warmth, while the orgeat adds almond sweetness that softens the citrus bite. For another smooth, citrus-driven option, you might also like the Whiskey Peach cocktail, which plays in a similar refreshing space with a fruit-forward twist.

Don't forget to see what other drinks you can make with the ingredients you already have in your bar.

Taste profile

The Casper the Ghost is elegant, well-balanced, and considerably more sophisticated than its playful name suggests. Reposado tequila opens with warm agave sweetness underpinned by gentle oak and vanilla from barrel aging — noticeably rounder and more complex than blanco tequila, with less of the raw peppery edge that can make unaged tequila sours feel sharp. Orgeat contributes a rich almond sweetness that is nutty, slightly floral, and deeply satisfying — the same ingredient that anchors the Mai Tai and the Trinidad Sour — while lime juice delivers the bright acidity that defines the sour category and keeps the sweetness in check. The egg white adds no flavour of its own but transforms the texture entirely, creating a velvety, creamy mouthfeel and the thick, cloud-like foam layer that is the drink's defining visual characteristic. The overall profile is smooth, citrus-forward, and gently sweet — approachable enough for casual drinkers, interesting enough for cocktail enthusiasts.

Serving suggestions

The dry shake is the most important step in this recipe and cannot be skipped — shaking without ice first is what builds the foam by forcing air into the egg white before the ice dilutes and stabilises the mixture. Shake without ice for a full 15 seconds, then add ice and shake again for another 15. Double-strain through a fine mesh strainer into a well-chilled coupe to achieve a smooth, clean foam surface free of ice chips. For Halloween presentation, use a cocktail dropper or toothpick dipped in grenadine or blackberry liqueur to draw a small ghost face on the foam surface immediately after pouring — the foam holds its shape long enough for simple designs if worked quickly. Angostura bitters dashed in a simple pattern on the foam also works well as a darker, more dramatic garnish option. For guests who prefer to avoid raw egg, aquafaba — the liquid from a tin of chickpeas — produces an almost identical foam using exactly the same technique and quantity.

Why You'll Love It?

Ingredients for Casper the Ghost

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Step‑by‑Step Instructions

1. Add tequila, orgeat, lime juice, and egg white into a shaker (no ice).
2. Dry shake vigorously for about 15 seconds to build foam.
3. Add ice and shake again until well chilled.
4. Strain into a chilled coupe or rocks glass, and let the foam settle for that signature ghostly top.