Penicillin Cocktail Recipe

The Penicillin is basically a whiskey sour with a smoky kick and a bright ginger-honey finish. It tastes bold, balanced, and a little surprising. If you like drinks that start smooth and end with a bit of bite, this is a good one to try.

It was created in New York by bartender Sam Ross, and it quickly became a bar favorite. That’s because it’s easy to like, easy to recognize, and not hard to make at home.

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Why people like the Penicillin

This cocktail works because it hits a few different notes at once:

• Smoky from Scotch
• Bright from lemon juice
• Sweet from honey-ginger syrup
• Spicy from fresh ginger
• Rich from blended Scotch in the float

The Tasting: The first sip is bright and a little sweet. Then the Scotch comes through. After that, the ginger adds warmth, and the smoky float leaves a lasting finish. It changes a bit as the ice melts, which is part of the fun.

Penicillin Cocktail: Extra Tips, Background, and Serving Ideas

The Penicillin is a great drink to know because it’s impressive and delicious, but anyone can make it. The hardest parts are the smoky whiskey float and making the honey-ginger syrup, unless you buy a bottle for that.

The float really isn’t hard, either…

Why the float technique matters

The smoky Scotch float changes how the drink smells and how the flavors hit your tongue. Pouring it gently over the back of a spoon helps it stay layered on top instead of mixing right into the drink.

If you don’t have a spoon handy, just pour slowly down the side of the glass. That works too. The goal is to let the float sit near the top for as long as possible. As you sip, the top layer gradually folds into the rest of the drink.

What you need

A Penicillin is made with simple ingredients, but the quality matters.

Choosing the right Scotch

You don’t need a rare bottle here. In fact, a very expensive Scotch would be wasted in a cocktail like this. A solid blended Scotch is the the best choice.

For the smoky float, an Islay Scotch is the classic choice. These whiskies are known for their peat smoke, sea air notes, and strong personality. A little goes a long way, so don’t add too much.

If you want something softer, use a lighter smoky Scotch instead of a heavy peat bomb. That keeps the drink more approachable for people who are new to smoky whiskey.

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Glassware & Garnish

A rocks glass is perfect for this drink. It’s sturdy, simple, and works well with ice. Large clear ice cubes are a nice upgrade if you have them. They melt more slowly and keep the drink from getting watery too fast.

Garnish is useful here, even if it seems optional. A slice of crystallized ginger gives a clue about the flavor before the first sip. Plus, you can eat it and it’s delicious!

A lemon wheel works well too, especially if you want the drink to look brighter and more classic.

When to serve it

The ginger and Scotch feel warming and and just right for cooler weather, so you might think of this as a winter drink. But the lemon keeps it fresh enough for year-round drinking.

It also works well after dinner. The drink has enough character to stand on its own, but it isn’t too heavy. If you’re serving it with food, it pairs nicely with roasted meats, grilled dishes, sharp cheeses, or anything with a little spice.

It also does well next to salty snacks, which help bring out the sweet and smoky parts.

Make-ahead and batching notes

The honey-ginger syrup is the easiest piece to prep ahead, and that’s a big help if you’re making more than one drink.

For parties, you can mix the Scotch, lemon juice, and syrup in a larger batch ahead of time, then shake individual servings with ice when it’s time to serve.

Don’t try to batch the smoky float into the base mix. As we said above, it’s better added at the end so each drink keeps that layered aroma.

If you’re making several drinks at once, keep the chilled glasses and ice ready first. That way, you can build each one quickly without rushing or melting too much ice along the way.

A few useful tips

Use fresh lemon juice. Bottled juice makes the drink taste flat.

Don’t skip the honey-ginger syrup. It’s what gives the cocktail its smooth body and warm spice.

Use a blended Scotch for the base, not a heavily peated one. The float gives the smoky note, so the drink stays balanced.

If you want a milder smoke flavor, use a smaller float. If you want more smoke, go a little heavier. Simple fix, big difference.

Getting the balance right

The Penicillin is one of those drinks where small changes matter. If it tastes too sweet, the honey syrup may be a little strong or the lemon may be a little light. If it tastes too sharp, it usually needs more sweetness or a slightly richer syrup.

A few practical fixes can help:

• If the drink seems too tart, add a tiny bit more honey syrup next time.
• If it seems too sweet, increase the lemon juice by a small amount.
• If the smoke is too strong, use less of the float or pour it more lightly.
• If the drink tastes flat, check that your lemon juice is fresh and your ginger syrup still tastes bright.

For the honey-ginger syrup

• 1/2 cup honey
• 1/2 cup water
• 1/4 cup fresh ginger, peeled and sliced

Instructions

1. Combine the honey, water, and ginger in a small saucepan.
2. Warm it over low heat, stirring until the honey dissolves.
3. Let it cool, then strain out the ginger. Chill before using.

Storage and prep

The honey-ginger syrup keeps in the fridge for about 1 week, sometimes a little longer if stored in a clean sealed container. If it smells off or looks cloudy in a bad way, toss it.

You can make the syrup ahead of time, which makes the cocktail much faster to build later. That’s the easiest part to prep in advance.