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Ingredients
Method
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Warm your glass first. A stemmed heatproof glass of around 200ml to 240ml capacity is what you want. Fill it with boiling water and leave it for 60 seconds, then tip the water out. A cold glass will drop the temperature of the coffee too fast and the cream layer will not hold cleanly.
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Brew your coffee strong. A French press or stovetop moka pot works well here. You are looking for something closer to espresso strength than filter strength. Weak coffee will be overwhelmed by the whiskey and the cream, and the drink will taste muddy. If you are using a French press, use 12g of coarsely ground coffee to 150ml of water just off the boil, and let it steep for 4 minutes before pressing slowly.
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Add the demerara sugar or sugar syrup to the warmed glass. Pour in the hot coffee and stir for about 20 seconds until the sugar has fully dissolved. This matters more than it sounds. Undissolved sugar sitting at the bottom changes the balance of the drink as you go through it.
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Add the Irish whiskey and stir once to combine. Do not stir again after this point.
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To prepare the cream: pour the cold double cream into a small jug or a wide-mouthed bowl and whip it very briefly, either with a small hand whisk or a fork. You want it thickened to the consistency of pouring yoghurt, not whipped to soft peaks. It should still flow slowly when the jug is tilted. Over-whipped cream will sit on the surface like a solid cap and will not interact with the coffee as you drink through it. If you have gone too far, add a small splash of cold cream and fold it in gently.
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Hold a warm dessert spoon, curved side up, just above the surface of the coffee, touching the inside rim of the glass. Pour the lightly whipped cream slowly over the back of the spoon so that it floats down gently onto the surface rather than breaking through. You should end up with a clean white layer, roughly 1.5cm to 2cm deep, sitting on top of the dark coffee. If the cream sinks, it was either under-whipped or the coffee was not hot enough.
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Grate a small amount of fresh nutmeg over the cream. Serve immediately, without a straw and without stirring. The intention is that you drink the hot coffee through the cold cream layer.
Irish Context
Irish Coffee as a drink has a specific origin point at Foynes flying boat terminal in County Limerick in the early 1940s, where it was developed to warm transatlantic passengers. That origin is well documented.
What is less often noted is how the drink became a fixture in Irish homes and hotel bars long before it became a tourist-facing item. The ratio of whiskey to coffee in domestic versions tends to be more generous than the bar version, and the cream is almost always whipped by hand in a jug rather than aerated in any sophisticated way.
The drink in its home setting is also less theatrical: no tableside presentation, just a warm glass and the smell of whiskey and coffee together when it comes out of the kitchen.
Tips
The cream must be cold and only lightly thickened. Take it straight from the fridge and whip for no more than 15 to 20 seconds.
This is the step where most people go wrong. Demerara sugar dissolves more slowly than caster sugar in hot liquid, so give it proper time and stir it thoroughly.
Sugar syrup avoids this problem entirely. To make a small batch, dissolve equal weights of demerara sugar and hot water, let it cool, and keep it in a jar in the fridge for up to two weeks.
Do not use cream that has been sitting at room temperature. The temperature difference between the hot coffee and the cold cream is what keeps the layers distinct for long enough to matter.
The choice of whiskey will change the drink noticeably. A lighter, triple-distilled Irish whiskey will let the coffee come through.
A single pot still whiskey with more spice and body will assert itself more. Neither is wrong, but they produce different results.
Use something you would drink straight. If the cream layer breaks and sinks, it can sometimes be rescued by gently floating a fresh spoonful on top, but it is better to start again with fresh cream at the correct consistency.
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