The cortado: why this little cup tastes bigger than it looks

There are days when an espresso feels a touch too sharp and a cappuccino a touch too much of a good thing. Right in between sits the cortado — a small glass in which espresso and warm milk hold each other in balance. I drink at least one a day myself, and it still surprises me how much coffee fits into such a modest serving.

What exactly is a cortado?

The name comes from the Spanish cortar: to cut. The milk "cuts" the sharpness of the espresso without drowning it out. In Spain you order a cortado in a small glass of around 90 to 120 ml. In the United States the same drink became popular under the name gibraltar, after the glass it was served in in San Francisco.

What sets it apart from its neighbours on the menu is mostly a matter of ratio and texture. A macchiato is espresso with a spoonful of foam. A flat white uses roughly twice as much milk. A cappuccino gets a thick layer of foam. The cortado sits right in between: about 1 part espresso to 1 part milk, with a thin, velvety layer of microfoam — not an air cushion.

Why the ratio decides everything

With a cortado you can't hide behind milk. In a big latte a mediocre espresso slips by unnoticed; in a cortado you taste everything. That's exactly what makes it lovely: if your beans are good and your extraction is right, a cortado tastes fuller and sweeter than that same espresso on its own.

That comes down to the milk sugars. When you heat milk to around 60 to 65 °C, the lactose partly breaks down into sweeter sugars. Heat it further — towards 70 °C or beyond — and that sweetness turns into a dull, slightly cooked flavour. With such a small amount of milk the margin is narrow, and that's precisely why you notice the difference straight away.

How to make a cortado at home

What you need

• 18 g freshly ground coffee (or 9 g for a single shot)
• About 60 ml fresh whole milk
• An espresso machine or moka pot
• A small 90–120 ml glass or cup
• A thermometer, or just your hand

Step by step

1. Pull a 36 g double espresso in roughly 25 to 30 seconds. Aim for a 1:2 ratio — 18 g in, 36 g out. No scale? Fill about a third of your glass.
2. Pour 60 ml of cold milk into your pitcher. You really don't need more; too much milk is the most common mistake.
3. Steam briefly with the tip just below the surface — two to three seconds of hissing is enough. Then sink the tip deeper and let the milk swirl until the pitcher gets too hot to hold (around 60 °C).
4. Tap and swirl the pitcher until the milk shines like wet paint. You don't want to see any big bubbles.
5. Pour from a low height into the middle of the glass, and only bring the pitcher closer at the very end. You'll get an even, creamy layer — latte art optional.

No steam wand?

You can manage without one. Heat the milk in a saucepan until it feels warm but is still comfortable to hold, pour it into a jar with a lid and shake hard for ten seconds. Or use a hand-pump milk frother. You won't get barista-grade microfoam, but for a cortado — where you want little foam anyway — it comes surprisingly close.

Which beans work best?

Because the milk stays modest here, a cortado gives you far more room to play than a cappuccino does. I usually look for beans with some body and sweetness, so the milk has something to hold on to.

• Washed coffees from Latin America — Colombia, Brazil, Costa Rica — give chocolate, caramel and nuts. The safest, and perhaps the tastiest, choice.
• Natural processed Ethiopia is more exciting: the milk rounds off the fruit acids and you get an almost strawberry-milkshake effect.
• Blends made for espresso are rarely a bad idea, especially while you're still dialling in.

What I'd avoid: very light, extremely acidic filter roasts. Those fight the milk instead of working with it.

The three mistakes I made most often myself

• Too much milk. Once you go past 80 ml you no longer have a cortado but a small flat white. Measure it out the first few times.
• Steaming too hot. If the pitcher is too hot to hold for three seconds, you've gone too far. Stop sooner than you think.
• Waiting to pour. Milk and foam separate within half a minute. Pour straight away, and keep swirling as you go.

Small cup, big reward

As far as I'm concerned the cortado is the most honest milk coffee there is: too small to hide mistakes, big enough to genuinely enjoy. And because it takes so little milk, it's also the quickest way to hear what a new bag of beans has to say.

Fancy giving it a go? Pick a washed Latin American coffee or an espresso blend from the shop and make one this afternoon. Let me know which combination works best for you — I'm always on the lookout for a new favourite.