There’s something undeniably sophisticated about shaking up a Penicillin cocktail at home, watching the amber liquid catch the light as ice settles into the glass. This modern classic combines smoky Scotch whisky with fresh lemon juice, ginger syrup, and a splash of honey, creating a drink that tastes like something a bartender spent years perfecting. What makes this recipe truly special is how it balances warmth and brightness, making it equally at home on a winter evening or as a show-stopping drink for guests.
The Penicillin is the kind of cocktail that proves you don’t need complicated techniques or rare ingredients to impress. Its beauty lies in the interplay of four simple components working in perfect harmony.
Why You’ll Love This Recipe
This cocktail delivers restaurant-quality results in your own kitchen with minimal fuss. Once you master the basic formula, you’ll find yourself making it repeatedly.
- Balanced flavors that appeal to whisky lovers and cocktail newcomers alike
- Requires only basic bartending skills and common bar tools
- Fresh, natural ingredients create a sophisticated taste
- Easily scaled up for entertaining crowds
- Works beautifully year-round, though perfect for cooler months
My Experience Making This Recipe
I first encountered the Penicillin at a craft cocktail bar in Seattle, and I was immediately hooked by the way the ginger and honey rounded out the Scotch’s smokiness. The bartender mentioned it was a relatively new creation in cocktail history, which surprised me given how perfectly balanced it felt.
When I recreated it at home, I realized the magic comes from using quality Scotch and making your own ginger syrup rather than using bottled ginger beer. The difference is remarkable, that fresh, spicy ginger flavor actually tastes like real ginger, not artificial sweetness.
My friends have become predictably demanding about this drink, texting me weeks before dinner parties with requests to have Penicillin cocktails ready. There’s something about the visual appeal and the complex flavor profile that makes people feel special.
Recipe Overview
- Recipe Name: Penicillin Cocktail
- Servings: 1
- Prep Time: 5 minutes
- Cook Time: 0 minutes
- Total Time: 5 minutes
- Course: Cocktail
- Cuisine: Modern American
- Calories per Serving: 165
Equipment You Will Need
- Cocktail shaker
- Jigger or measuring cups
- Barspoon or long spoon
- Strainer
- Rocks glass
- Cutting board
- Vegetable peeler or knife for citrus peel
- Small saucepan (for making ginger syrup)
Ingredients for Penicillin Cocktail
- 1.5 ounces peaty Scotch whisky
- 0.5 ounces honey ginger syrup
- 0.75 ounces fresh lemon juice
- 0.25 ounces Islay Scotch whisky (for the float)
- Ice cubes
- Fresh ginger slice or lemon peel for garnish
For the Honey Ginger Syrup
- 1 cup fresh ginger, peeled and sliced thin
- 1 cup honey
- 1 cup water
Ingredient Notes and Substitutions
- Peaty Scotch whisky provides the smoky backbone that defines this drink; if you can’t find peaty Scotch, use any single malt Scotch with medium body, though you’ll lose some of that signature smokiness.
- Honey ginger syrup adds natural sweetness and spice; you can substitute with equal parts honey and fresh ginger juice, though the syrup version provides better texture and integration.
- Fresh lemon juice brings brightness and essential acidity; bottled lemon juice will make the drink taste flat and chemical, so fresh is non-negotiable.
- Islay Scotch for the float intensifies the smoky character; regular peaty Scotch works if you don’t have Islay available, though the float won’t pack quite the same punch.
- Ice cubes should be large if possible, as they melt slower and keep the drink cold without diluting it too quickly.
How to Make Penicillin Cocktail
Step 1: Make the Honey Ginger Syrup
Combine peeled, sliced fresh ginger, honey, and water in a small saucepan and bring to a simmer over medium heat. Let this mixture steep for 10 to 15 minutes until the ginger flavor infuses deeply into the honey, then strain out the solids and cool completely before using.
Making your own syrup takes just minutes but transforms the entire cocktail from good to extraordinary. Store any leftover syrup in the refrigerator for up to two weeks.
Step 2: Gather Your Ingredients
Measure out 1.5 ounces of your peaty Scotch whisky into a jigger, then pour it into your cocktail shaker. Have your honey ginger syrup, fresh lemon juice, and ice ready to go.
Step 3: Prepare Your Glass
Fill a rocks glass with large ice cubes and set it aside while you build the drink. Cold glassware makes a significant difference in keeping your cocktail at the right temperature longer.
Step 4: Add Ice to the Shaker
Fill your cocktail shaker about halfway with ice cubes of similar size. Using ice of the same size ensures even chilling and proper dilution.
Step 5: Combine the Main Ingredients
Pour the measured Scotch, 0.5 ounces of honey ginger syrup, and 0.75 ounces of fresh lemon juice into the shaker with ice. The proportions matter here: too much syrup overwhelms the whisky, while too little lemon makes the drink cloying.
Step 6: Shake Vigorously
Seal the shaker and shake hard and fast for about 10 to 15 seconds until the outside of the shaker becomes frosty and cold. This aggressive shaking properly chills the drink and creates the right amount of dilution.
Step 7: Strain Into Your Glass
Using a strainer, pour the shaken mixture into your prepared rocks glass filled with ice. Work quickly so the drink stays as cold as possible during the transfer.
Step 8: Float the Islay Scotch
Carefully pour 0.25 ounces of Islay Scotch over the back of a barspoon so it floats on top of the drink in a distinct layer. This float creates a beautiful visual effect and delivers an extra punch of smoke with the final sips.
Step 9: Garnish and Serve
Slice a thin piece of fresh ginger or cut a lemon peel, add it to the glass, and serve immediately. A fresh ginger slice adds authentic flavor and looks elegant, while a lemon peel provides aromatic oils that enhance each sip.
Pro Tip: The key to a perfect Penicillin lies in the quality of your Scotch and the freshness of your lemon juice; invest in a decent bottle and squeeze lemons yourself, not from a bottle.
Tips for the Best Penicillin Cocktail
- Use ice cubes that are as large as possible; they chill the drink without over-diluting it in the seconds it takes to shake and strain.
- Make your honey ginger syrup at least a few hours ahead so it cools completely and you’re not adding warm syrup to cold ingredients.
- Juice your lemons fresh just before making the drink if possible; the flavor difference between fresh and bottled is genuinely shocking.
- Don’t skimp on the Scotch quality; a smoky, peaty single malt makes an enormous difference compared to blended whisky.
- Shake with confidence and speed; hesitant shaking won’t properly chill and dilute the drink to the ideal balance.
- Taste your honey ginger syrup as you make it; if the ginger flavor seems weak, steep it a bit longer or add slightly more ginger next time.
Common Mistakes to Avoid
- Using bottled lemon juice creates a chemical, flat-tasting cocktail that bears little resemblance to the real thing, so always squeeze fresh.
- Skipping the Islay float or using regular Scotch instead removes the signature smoky depth that makes this drink memorable.
- Over-shaking or under-shaking affects the texture and chill level; aim for about 10 to 15 seconds of vigorous shaking.
- Making the syrup too sweet or not sweet enough throws off the balance with the lemon and whisky; taste as you make it.
- Using small ice cubes causes rapid dilution, resulting in a watered-down drink by the time you take your second sip.
Serving Suggestions
The Penicillin pairs beautifully with appetizers and small bites that complement its smoky, citrus profile. Serve it before dinner as a sophisticated aperitif or alongside dessert for an unexpected finish.
- Smoked salmon canapés echo the drink’s peaty character
- Spicy nuts or candied ginger amplify the ginger syrup notes
- Sharp cheeses like aged cheddar create a pleasant contrast with the acidity
- Chocolate desserts add richness that plays well with the whisky’s warmth
- Grilled oysters benefit from the lemon juice’s brightness
Variations to Try
- The Smoky Ginger: Replace half the Scotch with bourbon for a softer, sweeter smoke that mellows the ginger spice.
- The Hot Penicillin: Add a small pinch of cayenne pepper to the honey ginger syrup for a warming kick that lingers pleasantly.
- The Maple Penicillin: Substitute maple syrup for half the honey in your syrup for deeper, molasses-like sweetness that plays beautifully with the smoke.
- The Herbal Twist: Steep a sprig of fresh thyme or rosemary in your honey ginger syrup for botanical complexity.
- The Spiced Penicillin: Add a pinch of ground cardamom or cinnamon to your honey ginger syrup for warming spice beyond just ginger.
Dietary Adaptations
- Gluten-free: Most Scotch whisky is gluten-free by nature, but verify your specific bottle; all other ingredients are naturally gluten-free.
- Dairy-free: This cocktail contains no dairy, so it’s naturally dairy-free as written.
- Vegan: Honey is not vegan; substitute with agave nectar in equal amounts, though you’ll lose some of the floral sweetness.
- Low-carb/keto: This cocktail contains sugar from the honey and some natural sugars in lemon juice; it’s not ideal for strict keto diets.
Storage and Reheating
Refrigerator
Store your honey ginger syrup in an airtight container in the refrigerator for up to two weeks. Mix individual Penicillin cocktails fresh to order; pre-made cocktails don’t keep well.
- Allow syrup to cool completely before refrigerating
- Label your container with the date you made the syrup
- Check the syrup for any discoloration or off-smells before using
Freezer
You can freeze honey ginger syrup in ice cube trays for easy portioning. Once frozen, transfer the cubes to a freezer bag and use within three months.
- Allow one frozen cube per cocktail
- Thaw slightly before using in the shaker
Reheating
Cocktails should never be reheated; always mix fresh. If your syrup has crystallized, warm it gently in a saucepan over low heat until liquid again.
- Never microwave syrup; use stovetop heating only
- Stir gently until dissolved and cool before using
Nutrition Information
| Nutrient | Amount |
|---|---|
| Calories | 165 |
| Total Fat | 0g |
| Saturated Fat | 0g |
| Carbohydrates | 12g |
| Fiber | 0g |
| Sugar | 11g |
| Protein | 0g |
| Sodium | 2mg |
| Cholesterol | 0mg |
Nutritional values are approximate and based on standard ingredient measurements. Actual nutrition may vary depending on specific brands and preparation methods used.
Frequently Asked Questions
Can I make a large batch of Penicillin cocktails ahead for a party?
You can pre-mix the Scotch, lemon juice, and honey ginger syrup in a pitcher, then shake with ice and strain into individual glasses just before serving. Making cocktails to order keeps them colder and fresher, but batch mixing works if you serve immediately after shaking.
What if I don’t have Islay Scotch for the float?
Use any peaty Scotch you have on hand; the float won’t be quite as intense, but it still adds smoky character. You can also skip the float entirely and add a bit more of your main Scotch if you prefer.
How do I know if my honey ginger syrup is the right consistency?
It should pour smoothly like honey but coat the back of a spoon; if it’s too thick, thin it with a tablespoon of water at a time. If it’s too thin, it won’t provide enough body and sweetness to the drink.
Why does my Penicillin taste watery or weak?
You’re likely using small ice cubes or not shaking hard enough for sufficient chill and dilution. Large ice and vigorous shaking for 10 to 15 seconds are non-negotiable for proper texture.
Can I use honey that’s crystallized or granulated instead of liquid honey?
Crystallized honey works fine; gently warm it to liquefy it before making your syrup. The sweetness profile remains the same, just the texture changes.
How much honey ginger syrup should I make?
The recipe above yields about two cups of syrup, which makes roughly 32 cocktails. Batch the ingredients proportionally if you need less, or store extra in the refrigerator for future use.
Final Thoughts
The Penicillin cocktail represents everything wonderful about home bartending: impressive results with straightforward technique and quality ingredients. Once you’ve made it a handful of times, you’ll understand exactly why it’s become a modern classic worth mastering.
Give yourself permission to experiment with the honey ginger syrup and don’t hesitate to adjust proportions to match your taste preferences. Your guests will absolutely appreciate the effort, and you’ll gain confidence as a home bartender with every single drink you craft.
If you’re curious about expanding your cocktail repertoire, check out our penicillin soup recipe for a warming, savory companion. You might also enjoy learning to make your own sour mix recipe to streamline your cocktail-making process.
Penicillin Cocktail
Ingredients
Equipment
Method
- Step 1: Combine peeled, sliced fresh ginger, honey, and water in a small saucepan and bring to a simmer over medium heat.
- Step 2: Let the mixture steep for 10 to 15 minutes, then strain out solids and cool completely.
- Step 3: Fill a rocks glass with large ice cubes and set aside.
- Step 4: Add ice to the cocktail shaker until it is half full.
- Step 5: Measure and pour 1.5 ounces peaty Scotch, 0.5 ounces honey ginger syrup, and 0.75 ounces fresh lemon juice into the shaker.
- Step 6: Seal the shaker and shake vigorously for 10 to 15 seconds until frosty.
- Step 7: Strain the mixture into the prepared rocks glass over fresh ice.
- Step 8: Pour 0.25 ounces of Islay Scotch over the back of a barspoon to float on top.
- Step 9: Garnish with a fresh ginger slice or lemon peel and serve immediately.