Penicillin Cocktail Recipe | Scotch, Honey, Ginger & Smoke

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Julian Vernon

8/30/20267 min read

Penicillin Cocktail Recipe: Scotch, Honey, Ginger & Smoke

The Penicillin is one of the defining modern classic cocktails—a bold combination of Scotch whisky, fresh lemon, honey, ginger, and a smoky Islay Scotch float.

Created in New York in the early 2000s, the Penicillin demonstrates something every bartender should understand: a great cocktail doesn't need dozens of ingredients. It needs balance, structure, and contrast.

Sweet honey softens the whisky. Fresh lemon provides acidity. Ginger adds warmth and spice. And a small amount of smoky Scotch floating over the finished drink creates an unmistakable aromatic finish.

The result is rich, refreshing, spicy, smoky, and surprisingly approachable.

Penicillin Cocktail at a Glance

Style: Modern Classic / Whisky Sour
Base Spirit: Blended Scotch Whisky
Flavor Profile: Smoky • Citrusy • Honeyed • Spicy
Difficulty: Intermediate
Glassware: Rocks Glass
Technique: Shake
Ice: Large Cube
Garnish: Candied Ginger
Best For: Whisky drinkers, fall and winter cocktails, after-dinner drinks, and anyone exploring Scotch cocktails

The Story Behind the Penicillin

The Penicillin was created by bartender Sam Ross at New York City's Milk & Honey in the mid-2000s.

Rather than starting entirely from scratch, Ross drew inspiration from another modern cocktail, the Gold Rush, which combines bourbon, lemon juice, and honey syrup.

For the Penicillin, bourbon was replaced with blended Scotch, while fresh ginger and a smoky Islay Scotch float introduced two additional layers of flavor.

The name is a playful reference to the famous medicine. With honey, lemon, and ginger—ingredients traditionally associated with soothing cold symptoms—the connection made perfect sense.

But it was the drink itself, rather than simply its clever name, that made the Penicillin endure.

It spread from Milk & Honey to cocktail bars around the world and eventually became recognized as one of the most influential cocktails of the modern craft-cocktail era.

Why the Penicillin Works

The Penicillin is essentially built around the familiar structure of a sour:

Spirit + Citrus + Sweetener

But each component adds another dimension.

Blended Scotch provides the foundation. Lemon supplies acidity. Honey balances the citrus. Ginger introduces heat and spice.

Then comes the ingredient that transforms the drink: smoky Islay Scotch.

Instead of simply adding more whisky to the shaker, a small amount is floated over the finished cocktail. Because aroma strongly influences our perception of flavor, the smoke reaches your nose before you even take the first sip.

That contrast between the bright, spicy drink underneath and the smoky aroma above is what gives the Penicillin its character.

Julian's Pro Tip: Don't overpower the drink with the Islay Scotch. The float should provide an aromatic layer of smoke—not turn the entire cocktail into a heavily peated whisky drink.

How to Make the Penicillin

Ingredients

2 oz blended Scotch whisky
¾ oz fresh lemon juice
¾ oz honey-ginger syrup
¼ oz Islay Scotch whisky, for the float
Candied ginger, for garnish

How to Make Honey-Ginger Syrup

The honey-ginger syrup is one of the most important components of this cocktail.

Ingredients

½ cup honey
½ cup water
Fresh ginger, peeled and sliced

Method

Combine the honey, water, and fresh ginger in a small saucepan.

Warm gently while stirring until the honey is completely incorporated. Do not aggressively boil the mixture.

Remove it from the heat and allow the ginger to steep for approximately 20–30 minutes, depending on how pronounced you want the ginger flavor.

Strain, allow it to cool, and refrigerate in a sealed container.

For the Penicillin, you want enough ginger intensity to remain noticeable after shaking with whisky, citrus, and ice.

Method

1. Add the Scotch

Pour 2 oz blended Scotch whisky into your cocktail shaker.

A good blended Scotch provides enough whisky character to stand up to the lemon and ginger without overwhelming the cocktail.

2. Add Fresh Lemon Juice

Add ¾ oz freshly squeezed lemon juice.

Fresh citrus is especially important here. Bottled lemon juice will not provide the same brightness or balance.

3. Add Honey-Ginger Syrup

Add ¾ oz honey-ginger syrup.

This provides both the sweetness and the warming ginger character that defines the cocktail.

4. Add Ice Last

Once all of your liquid ingredients are in the shaker, add ice last.

This gives you greater control over dilution and prevents the cocktail from beginning to dilute while you're still measuring ingredients.

5. Shake

Shake vigorously until the cocktail is properly chilled and diluted.

6. Strain

Strain into a rocks glass over one large clear cube.

7. Add the Islay Scotch Float

Gently float ¼ oz Islay Scotch over the surface of the drink.

You can carefully pour it over the back of a bar spoon for greater control.

8. Garnish

Finish with a piece of candied ginger.

Choosing the Right Scotch

One of the most interesting things about the Penicillin is that it uses Scotch whisky in two different roles.

Blended Scotch — The Foundation

The base whisky should be approachable and balanced.

You want enough malt and whisky character to remain present without excessive smoke dominating the lemon, honey, and ginger.

The blended Scotch is the backbone of the cocktail.

Islay Scotch — The Aroma

The Islay Scotch has a completely different job.

Islay whiskies are famous for flavors and aromas that can include peat smoke, earth, maritime salinity, and medicinal characteristics.

Because only a small amount is floated over the cocktail, it creates a dramatic aromatic effect without overwhelming the drink.

This is an excellent example of using an ingredient strategically rather than simply using more of it.

Understanding the Technique: The Whisky Float

The float is not simply decorative.

Because the Islay Scotch remains concentrated near the surface, its smoky aroma reaches your nose as you bring the glass toward your mouth.

That aroma changes how you experience the drink underneath.

As you continue drinking, the smoky whisky gradually integrates with the cocktail, meaning the Penicillin can subtly evolve from the first sip to the last.

It's a simple technique with a significant sensory impact.

Common Penicillin Mistakes

Using Too Much Smoky Scotch

More smoke isn't necessarily better.

Too much heavily peated whisky can bury the honey, ginger, lemon, and blended Scotch.

Weak Ginger Flavor

The ginger should be noticeable.

If your syrup is overly sweet but lacks ginger intensity, the cocktail loses one of its defining characteristics.

Using Bottled Lemon Juice

The Penicillin depends on bright acidity. Freshly squeezed lemon juice produces a noticeably better cocktail.

Poor Dilution

Under-shaking can leave the drink sharp and disconnected, while excessive dilution can flatten its flavors.

Shake until properly chilled, then strain promptly.

Adding Ice Too Early

Measure your liquid ingredients first and add ice immediately before shaking. This provides better control over dilution.

What Does a Penicillin Taste Like?

The first impression is often smoke.

Then the drink opens into bright lemon, mellow Scotch, rich honey, and warming ginger.

The flavors move through the drink rather than arriving all at once:

Smoke → Citrus → Honey → Ginger → Whisky

That progression is one of the reasons the Penicillin is so satisfying.

It's complex enough for an experienced whisky drinker but approachable enough to introduce someone to Scotch cocktails.

Food Pairing

The Penicillin pairs especially well with foods that complement either its smoky Scotch character or its honey-and-ginger sweetness.

Try it with:

Smoked salmon crostini — the smoke in the salmon echoes the Islay Scotch.
Aged cheddar — rich, sharp cheese stands up beautifully to whisky and ginger.
Grilled pork — caramelized flavors work naturally with honey and Scotch.
Spiced nuts — an easy pairing that highlights the cocktail's warming spice.
Dark chocolate — especially enjoyable if you're serving the Penicillin as an after-dinner cocktail.

Cocktail A to Z Pairing Pick: Smoked salmon crostini. The smoky, savory salmon complements the Islay Scotch while the cocktail's lemon cuts through the richness.

Can You Make a Penicillin Without Islay Scotch?

Yes—but you'll lose one of the drink's defining characteristics.

If you're new to heavily peated whisky, start with a very small float rather than eliminating it entirely.

The goal isn't to make the cocktail taste overwhelmingly smoky.

The goal is to experience that first aromatic layer of peat before reaching the brighter honey, lemon, ginger, and Scotch flavors underneath.

The Penicillin Cocktail Formula

Once you understand the structure, the Penicillin becomes more than simply a recipe.

It becomes a lesson in cocktail construction.

Base: Scotch whisky
Acid: Lemon
Sweet: Honey
Spice: Ginger
Aromatic Accent: Islay Scotch

This structure demonstrates how a bartender can take the basic sour formula and add layers without destroying its balance.

That's one of the reasons the Penicillin deserves its place among the modern classics.

Julian's Final Take

The Penicillin is a cocktail every serious home bartender should make at least once.

It starts with a familiar sour structure, but the ginger and smoky Scotch elevate it into something much more distinctive.

More importantly, it teaches several valuable bartending principles at the same time: balancing spirit, citrus, and sweetness; controlling dilution; building flavor through homemade syrup; and using aroma as part of the drinking experience.

Master those ideas and you're not simply learning how to make a Penicillin.

You're learning why great cocktails work.

Penicillin Recipe Card

2 oz Blended Scotch Whisky
¾ oz Fresh Lemon Juice
¾ oz Honey-Ginger Syrup
¼ oz Islay Scotch Float

Add the Scotch, lemon juice, and honey-ginger syrup to a shaker. Add ice last and shake until properly chilled. Strain into a rocks glass over one large clear cube. Float the Islay Scotch over the surface and garnish with candied ginger.

Glass: Rocks
Ice: Large clear cube
Garnish: Candied ginger
Technique: Shake + Float

Watch: How to Make the Penicillin

Want to see the technique in action?

Watch my Penicillin Cocktail video on Cocktail A to Z, where I walk through the recipe, honey-ginger syrup, shaking technique, Scotch float, garnish, and final presentation.

WATCH ME MAKE THE PENICILLIN

Explore More Cocktails

If you enjoyed the Penicillin, continue exploring Cocktail A to Z for classic cocktails, modern favorites, bartending techniques, ingredients, glassware, and practical tips designed to help you understand not just what to make—but why it works.

Master the classics. Understand the craft. Make better cocktails.

— Julian Vernon | Cocktail A to Z