What Is Irish Coffee and How to Make It

If you’ve ever wondered what makes a drink both coffee and cocktail—something warm, boozy, and comforting—Irish Coffee is likely what you’re thinking of. It’s not just coffee with a shot of booze poured in. There’s technique, tradition, and a romantic backstory behind every creamy, boozy sip.

The classic Irish Coffee contains roughly 30ml (1 ounce) of Irish whiskey, 150ml (5 ounces) of hot strong coffee, sugar (usually a teaspoon), and topped with lightly whipped fresh cream. The key ratio is around 1 part whiskey to 5 parts coffee.

What Is Irish Coffee?

Irish Coffee is a warm, alcoholic coffee beverage that blends hot coffee, Irish whiskey, sugar, and topped with cream. It looks like a coffee but drinks like a cocktail. It originated in the 1940s at Shannon Airport in Ireland, created by bartender Joseph Sheridan for cold and tired passengers, especially American travelers crossing the Atlantic.

The drink combines strong elements: coffee for caffeine, whiskey for warmth, sugar for balance, and cream for texture. Despite being a cocktail, it’s served in coffee cups and often enjoyed as a comforting nightcap or winter warmer.

The Romantic (and Accidental) Origin Story

The creation of Irish Coffee is steeped in a love story set in 1940s Dublin. Joseph Sheridan, a bartender at Foynes Airport (later moved to Shannon), invented the drink for weary American passengers. He was trying to impress a beautiful stewardess who never ordered cocktails—but loved coffee.

Sheridan mixed Irish whiskey with hot coffee and sugar, hoping she’d try his creation. He called it “Irish Coffee” and put it on the menu, waiting for her to notice. It took a full year before she tried it—and loved it. The first cup was made with tears of joy (literally: Sheridan cried while making it), and some say that’s why it’s also nicknamed “angel’s tears.”

The drink stayed local until the stewardess moved to San Francisco and asked for it at a local café. That’s how Irish Coffee spread to the U.S., where it became a café staple long before it was widely known in Ireland.

What’s in Irish Coffee? Ingredients & Ratios

A traditional Irish Coffee is made with very specific components:

• Irish whiskey: ~30ml (1 ounce)
• Hot strong coffee: ~150ml (5 ounces)—coffee choice is flexible, just needs to be hot and bold
• Sugar: 1 teaspoon (typically white sugar, but cube or coffee-specific sugar works too)
• Fresh cream: lightly whipped, floated on top

The standard ratio is approximately 1 part whiskey to 5 parts coffee. The coffee acts as the base, the whiskey adds depth, sugar balances the bitterness, and cream softens the finish.

The Special Glassware and Preparation Method

Irish Coffee is traditionally served in a tall, handled, heat-resistant glass with three lines etched into the side. The bottom line marks 1 ounce (for whiskey), the top line marks 180ml (for coffee).

Before pouring the drink, the glass is “baked” or “warmed” with a flame to help burn off excess alcohol and enhance aroma. Here’s how that works:

• Add a spoonful of sugar and about 15–30ml of Irish whiskey into the glass
• Heat the base with a small flame (alcohol or gas lamp)
• Hold the cup properly and rotate it evenly to warm
• When the alcohol begins to burn off (visible as blue flames), let it burn out
• Pour in hot coffee up to the middle line, add sugar, stir until dissolved
• Top gently with freshly whipped cream, poured over the back of a spoon so it floats

How to Make Irish Coffee Step by Step

Here’s a reliable method used by bartenders and home enthusiasts alike:

1. Take a warmed Irish Coffee glass. Add ½ to 1 ounce of Irish whiskey and 1 teaspoon of sugar.
2. Place the glass on a holder above a small flame and warm gently while rotating the base for even heat. Stop when the alcohol begins to evaporate or slightly smoke.
3. Optional: briefly ignite the whiskey for about 5 seconds for effect, then extinguish.
4. Pour in freshly brewed hot coffee (about 150ml) to about ¾ full.
5. Stir until the sugar dissolves.
6. Top with gently whipped fresh cream, poured over the back of a spoon so it floats on top.

Some variations include igniting the drink briefly or using salt on the rim, said to represent tears. The key is to have the cream float without mixing into the coffee below—it’s meant to be sipped through the cream.

Common Mistakes and Myths

Many people make Irish Coffee incorrectly by:

• Using cold or whipped cream (it should be softly whipped, not stiff)
• Pouring cream into the coffee and stirring (it ruins the layered effect)
• Using too much whiskey or too little coffee, throwing off the balance
• Not warming the glass or properly dissolving the sugar

Also, contrary to popular belief, Irish Cream liqueur is not used in traditional Irish Coffee—only Irish whiskey.

Health and Drinking Considerations

While enjoyable, Irish Coffee is not a health drink. The caffeine and alcohol combination can be dehydrating. Health authorities recommend limiting coffee intake to around 300mg of caffeine per day (about 3–4 cups of filtered coffee). Drinking Irish Coffee for weight loss is not advisable—it can cause insomnia, stomach irritation, and anxiety in sensitive individuals.

People with ulcers, heart conditions, or sleep issues should avoid it. Enjoy it occasionally, and always drink responsibly.

Frequently Asked Questions

What’s the difference between Irish Coffee and a regular coffee with whiskey?

Irish Coffee is a specific drink with a defined recipe: hot strong coffee, Irish whiskey, sugar, and a float of cream. A regular coffee with whiskey is just adding any whiskey to coffee, with no specific proportions or technique. Irish Coffee is also served in a special glass and traditionally has the cream layered on top, not mixed in.

Do you stir Irish Coffee?

You stir the coffee and sugar together after adding the whiskey and warming it, but you do not stir after the cream is added. The cream should float on top and be sipped through for the intended experience.

Can I use other types of whiskey?

Traditionally, Irish Coffee is made with Irish whiskey. Using Scotch, bourbon, or other whiskies will change the flavor profile significantly. Irish whiskey is smoother and slightly sweeter, which complements the coffee and cream better.

What kind of coffee is best for Irish Coffee?

The original recipe calls for a strong, hot black coffee—no specific origin or roast. Most use a dark or medium-dark roast for bold flavor. A rich single origin or espresso blend works well. The coffee’s role is to provide a strong base, so it should be hot, fresh, and not overly acidic.

Why is cream floated on top?

The cream is floated to create a contrast in textures and flavors. You’re meant to sip the drink through the cream, which tempers the strength of the coffee and whiskey. This layering is a key part of the traditional experience and is achieved by pouring cream over the back of a spoon.

Recommended FrontStreet Beans for Irish Coffee

For Irish Coffee, choose bold, rich single origins or blends that stand up to whiskey and cream. FrontStreet Coffee’s PWN Golden Mandheling offers deep body and low acidity with sweet notes of malt and dried fruit, making it a great base. Their Ethiopia Yirgacheffe adds bright fruitiness that contrasts nicely with the cream. For a darker option, try their Lintong Mandheling, which brings earthy, chocolatey tones. All work well as a strong hot coffee foundation in this classic drink. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.