Penicillin Whisky Cocktail: Honey & Ginger Recipe

The Penicillin cocktail has become a modern classic for good reason. This warming, aromatic drink combines blended Scotch whisky with the comfort of honey and the gentle spice of fresh ginger, balanced with zesty lemon. It's the kind of drink that feels sophisticated when you're serving guests, yet easy enough to batch for a dinner party. Whether you're building your home bar or looking to impress, understanding this recipe will give you a versatile foundation for countless variations.

What Is the Penicillin Cocktail?

The Penicillin is a contemporary cocktail that emerged in the early 2010s, created at bartender's collective Milk & Honey in New York. Despite its American origins, it has become beloved in British home bars and gastropubs because it taps into something we Brits adore: warming spices and honey-sweetened comfort drinks. The name is playful—it's meant to be a "cure" for what ails you on a cold evening.

The drink sits beautifully within the broader family of whisky cocktails, though it's distinct from traditional sours or smashes. The combination of blended whisky, fresh ginger, honey syrup, and lemon creates a drink that's simultaneously smooth, spiced, and refreshing. It's ideal for autumn and winter entertaining, but works year-round if you're fond of warming flavours.

The Classic Penicillin Recipe

Here's what you'll need to make a single serve:

• 45 ml blended Scotch whisky (such as Johnnie Walker or Compass Box)
• 25 ml fresh lemon juice
• 20 ml honey ginger syrup (see below)
• 2–3 thin slices of fresh ginger, plus one for garnish
• Ice cubes

Method: Add the whisky, lemon juice, honey ginger syrup, and fresh ginger slices to a cocktail shaker filled with ice. Shake vigorously for about 10–12 seconds until well chilled and the outside of the shaker frosts. Strain into a rocks glass filled with fresh ice cubes. Garnish with a thin slice of ginger and, if you fancy it, a twist of lemon peel. The drink should be served cold and served relatively quickly so the ice doesn't over-dilute it.

Making Your Honey Ginger Syrup

The honey ginger syrup is the heart of this drink, and it's simple to prepare at home. You can make a batch and keep it refrigerated for up to two weeks, which makes it convenient for hosting.

• 100 ml clear honey (runny honey works best)
• 100 ml water
• 40 g fresh ginger, sliced thinly (no need to peel)

Heat the water in a small saucepan and add the sliced ginger. Let it simmer for about 8–10 minutes until the water becomes infused with ginger flavour. Remove from heat and let it cool completely, then add the honey and stir well. Strain out the ginger pieces and pour the syrup into a clean bottle. The longer it sits, the more pronounced the ginger flavour becomes, so don't hesitate to make it a day or two ahead of your gathering.

If you prefer a less sweet drink, you can thin the syrup with a little extra water or use less of it when building your cocktail. Conversely, if you love honey and ginger warmth, add an extra teaspoon of the syrup per drink.

Whisky Selection: What Works Best

The beauty of the Penicillin is that it's forgiving when it comes to whisky choice. The recipe traditionally calls for blended Scotch because it provides a smooth, slightly sweet base that doesn't overpower the ginger and honey. However, you can experiment.

Blended Scotch: Johnnie Walker Red Label or Compass Box Great King Street are excellent budget-friendly choices. They're mild enough to let the ginger shine but robust enough to anchor the drink.

Single malt: If you reach for a lighter Speyside or Lowland malt (around 40% ABV), you'll get more complexity. Avoid heavily peated malts like Islay whiskies—they'll clash with the delicate ginger-honey balance.

Irish or American whiskey: You could make a variation using Irish whiskey or bourbon, though it becomes a different drink entirely. If you're curious about exploring bourbon cocktails or other whiskey directions, The Cocktail Pub's AI generator can suggest creative twists based on what you have on hand.

Flavour Balance and Variations

The Penicillin's magic lies in balance. Too much ginger and it becomes a medicine; too much honey and it cloaks the whisky's character. The 2:1 ratio of lemon juice to honey syrup keeps it from becoming saccharine, whilst the fresh ginger slices muddled in the shaker release oils that add warmth and spice.

Once you've mastered the classic, consider these variations for your home bar repertoire:

• Smoky version: Replace half the blended Scotch with a peated single malt like Talisker for a medicinal, smoky edge.
• Spicy version: Add a pinch of cayenne pepper or a dash of hot sauce to the syrup for a warming kick.
• Herbaceous version: Muddle a few fresh basil or thyme leaves with the ginger for a herbal note.
• Lighter version: Increase the lemon juice to 30 ml and reduce the honey syrup to 15 ml for a sharper, more refreshing drink.

Each variation still feels like a Penicillin because the ginger-honey-whisky triad remains the core. If you'd like to explore how these ingredients work across other spirits, our blog guides cover variations with gin cocktails and other bases too.

Hosting Tips: Serving the Penicillin

The Penicillin is an excellent cocktail for entertaining at home. It's warm enough to feel like a proper drink (not a sugary sipper), it's visually appealing with the ginger garnish, and guests often appreciate something a bit different from the usual Negroni or Martini round.

Batch preparation: If you're hosting, make your honey ginger syrup ahead of time. You can even pre-measure the whisky and lemon juice into a jug in the morning, then shake individual drinks as guests arrive. This keeps you from being stuck behind a makeshift bar all evening.

Ice matters: Large ice cubes melt more slowly, so your drinks stay cold without becoming watered-down. If you have the space and inclination, freezing ice in a loaf tin produces perfect large chunks.

Garnish presentation: A thin, fresh slice of ginger or a lemon twist elevates the presentation. It's a small touch that makes the drink feel considered. Some bartenders even flame a lemon peel over the surface to add a hint of citrus oil aroma.

Glassware: A rocks glass is traditional, but you can serve it in a coupe glass for a more elegant feel, or even a nosing glass if you want to emphasise the aroma. Just ensure it's well-chilled beforehand by keeping glasses in the freezer.

Building Your Home Bar for Whisky Cocktails

Making Penicillin cocktails regularly is a good reason to stock a solid blended Scotch. If you're building your whisky collection for cocktails, you'll want bottles that are approachable and versatile—the kind that work equally well in a Penicillin, a classic Whisky Sour, or a simple serve over ice. Look for something in the £18–£25 range for regular use.

You'll also want to keep fresh lemons and ginger on hand, plus good honey. Raw or local honey adds complexity, but any clear honey works fine. For a well-stocked home bar, explore our full range of whisky cocktail recipes to understand how different whiskey styles suit different drinks.

Beyond the Penicillin, having versatile spirits—whisky, gin, rum—means you can adapt to what guests enjoy. The Cocktail Pub generator can suggest recipes based on your bottle collection, so you're never stuck wondering what to make.

Shopping for Quality Ingredients

To make an excellent Penicillin, quality matters, especially for the whisky and lemon. Fresh lemon juice is non-negotiable—bottled juice won't give you the bright, zesty finish this drink needs. For whisky, reputable spirits retailers stock a wide range of blended Scotches at various price points. Master of Malt offers an extensive selection of Scotch whiskies and can help you find a good blended bottle suitable for cocktails.

Fresh ginger is typically available at any supermarket, and it's worth buying extra since it keeps well in the fridge. Good-quality honey is equally important; it's often cheaper and more flavourful from a farmers' market or local producer than supermarket brands.

Frequently Asked Questions

Can I make a Penicillin without fresh ginger?

Technically yes, but it won't taste like a Penicillin. The drink's character depends on the fresh ginger's peppery warmth and subtle spice. If fresh ginger is unavailable, you could substitute a small amount of ginger cordial or ginger beer (diluted), though the result will be less refined. For the authentic experience, fresh is best.

How long will honey ginger syrup last in the fridge?

A properly made honey ginger syrup will keep for 10–14 days in a sealed, sterilised bottle in the refrigerator. The honey acts as a preservative, but if you notice any cloudiness or off odours, it's time to make a fresh batch. For longer storage (a few weeks), you can add a tablespoon of vodka or other neutral spirit to the finished syrup as a preservative.

Is the Penicillin a sour?

Not exactly—it's sometimes called a "sour-style" drink because it uses lemon juice and a sweetener, but it's more accurately a spiced whisky drink or warming cocktail. Unlike a traditional sour, it doesn't contain egg white and relies on the honey ginger syrup for its distinctive character rather than simple syrup.

What's the best time of year to serve a Penicillin?

Autumn and winter are ideal—the warming spices and honey make it feel seasonal and cosy. That said, there's no rule stopping you from serving it year-round. On a chilly summer evening or in an air-conditioned room, it's just as welcome. Some people love the contrast of a warming drink served ice-cold.

Can I batch the Penicillin for a dinner party?

Yes, absolutely. Mix the whisky, lemon juice, and honey ginger syrup in a large jug a few hours ahead, then keep it in the fridge. When guests arrive, pour over fresh ice in individual shakers (or batches of four in a large shaker), add the fresh ginger slices, shake, and strain into rocks glasses. This keeps you flexible and prevents you from being stuck making drinks one at a time.

What's the difference between a Penicillin and a Dark and Stormy?

They're quite different drinks. A Dark and Stormy uses rum, ginger beer, and lime, and has a much lighter, more refreshing profile. The Penicillin is whisky-based with fresh ginger syrup and honey, creating a warmer, more complex drink. Both are excellent, but they suit different occasions and palates.

Can I use a honey liqueur instead of honey syrup?

You could experiment, but it would alter the drink's balance significantly. Honey liqueurs are often quite sweet and may muddy the ginger's flavour. The syrup approach gives you control over sweetness and allows the fresh ginger to shine. Stick with the syrup method for the classic taste.

Conclusion

The Penicillin cocktail is a modern classic that deserves a permanent spot in your home bar rotation. Its blend of warming ginger, smooth honey, and quality whisky creates a drink that's sophisticated, approachable, and perfect for cosy entertaining. Whether you're serving guests or enjoying a quiet evening, mastering this recipe opens the door to countless variations and a deeper appreciation for how simple, quality ingredients can create something special. Head over to The Cocktail Pub to explore more whisky cocktail ideas and discover new recipes tailored to your taste—our AI generator is ready to help you find your next favourite drink.

Recipes by spirit

Browse cocktail ideas on The Cocktail Pub:

• Whisky cocktails — classic recipes and ideas
• Gin cocktails — classic recipes and ideas
• Bourbon cocktails — classic recipes and ideas

More guides in the journal or use the AI generator.