Penicillin – Smoky Scotch Honey-Ginger Sour Modern Classic

The Penicillin is a modern Scotch cocktail that layers bright lemon and honey with fresh ginger and a smoky Islay whisky finish. Built like a sour but given extra depth from two styles of Scotch, the Penicillin cocktail moves from citrus and honey on the first sip to ginger spice and peat on the finish.

From Milk & Honey to Modern Classic

Australian bartender Sam Ross created the Penicillin at New York City's Milk & Honey in 2005. Inspired by the bar's Gold Rush, he replaced bourbon with Scotch and added ginger plus a float of smoky Islay single malt. The combination spread well beyond New York and became one of the defining modern cocktails of the early 21st century.

What You'll Need

Ingredients

• Blended Scotch Whisky - provides the malty, approachable whisky base.
• Lagavulin 16 yr old Single Malt Scotch - forms the smoky, peated aromatic float.
• Lemon Juice - supplies the acidity that balances the honey.
• Honey Syrup - adds sweetness and a rounded honey flavor while mixing easily into a cold drink.
• Ginger - brings fresh heat and spice through muddling.
• Candied Ginger - finishes the drink with a sweet, spicy garnish.

For the IBA version, keep the core ingredients as written. If Lagavulin 16 is unavailable, another assertively peated Islay single malt can provide a similar smoky float. Homemade honey syrup is an easy substitute for bottled honey syrup and mixes more cleanly than straight honey.

Equipment

You'll need an Old Fashioned glass, cocktail shaker, muddler, jigger, fine-mesh strainer, and ice. A bar spoon can help you add the Scotch float gently.

Why the Penicillin Works So Well

This drink gets its character from contrast. Blended Scotch gives it structure without overwhelming the citrus, honey softens the lemon, and fresh ginger adds a warm bite. The small layer of peated single malt sits on top instead of disappearing into the shaker, so its smoky aroma reaches you before each sip.

Substitutions & Variations

For a less smoky variation, use a gentler peated single malt for the float. For more peat, choose a more assertive Islay whisky, but keep the quantity small so it stays aromatic rather than dominating the drink.

You can also experiment with different blended Scotches to change the malt, fruit, and oak character of the base. Keep the lemon, honey, and ginger proportions unchanged when comparing whiskies so the balance stays consistent.

For the official IBA-style Penicillin, use fresh lemon juice, honey syrup, fresh ginger, and the Islay whisky float rather than replacing those components with flavored syrups or bottled sour mix.

Helpful Tips

• Muddle gently. Press the ginger enough to release its juice and aroma without pulverizing it.
• Use fresh lemon juice. The acidity is central to balancing the honey syrup and whisky.
• Fine-strain the drink. This catches small pieces of muddled ginger and gives the cocktail a cleaner texture.
• Use fresh ice in the glass. Don't dump the shaker ice into the serving glass.
• Float the Islay Scotch last. Keeping it on the surface makes its smoke much more noticeable on the nose.
• Serve without a straw. Drinking directly from the glass keeps the aromatic Scotch float close to your nose.