Affogato: How to Make Italy’s Espresso-Drowned Gelato

An affogato is a scoop of gelato — fior di latte, a plain milk flavour, or vanilla — with a shot of hot espresso poured over it. To make one, put a single scoop in a small chilled glass, pull a shot of espresso into a little jug, and pour it over the gelato at the table, so the first spoonful is still both hot and cold.

The name means "drowned" in Italian; in full it is affogato al caffè, drowned in coffee. It is the simplest dessert in the Italian café repertoire and one of the best, and the few things that can go wrong are all about temperature.

The recipe

1. Chill a small glass or cup in the freezer for a few minutes.
2. Scoop the gelato. If it comes from a home freezer, let it stand for a few minutes first so it scoops cleanly and is not rock-hard.
3. Pull a shot of espresso into a small jug or cup. The espresso guide explains what a good shot is.
4. Pour it over the gelato at the table, with the liqueur if you are using one.
5. Eat it straight away, spooning gelato and sipping the coffee that pools beneath it.

Cafés often serve it in a tall glass with a narrow bottom, so that the melting gelato and espresso collect together at the base.

Why it stays half frozen

The pleasure of an affogato is the contrast, and it lasts longer than you might expect because melting ice takes a great deal of energy.

Run the numbers. Say the shot lands at about 70 °C. Water — and espresso is mostly water — releases about 4.18 joules for every gram cooled by one degree, so a 30 g shot cooling all the way to 0 °C gives up roughly 30 × 4.18 × 70 ≈ 8.8 kJ. Melting ice, by contrast, absorbs 334 joules per gram without any change in temperature. Even if every joule went into melting, the shot could melt at most about 26 g of ice.

A half-cup scoop of vanilla ice cream weighs about 66 g, and the USDA lists vanilla ice cream at 61% water — about 40 g, much of it frozen. Before any of that ice can melt, the shot also has to warm the scoop from freezer temperature. So a single shot cannot melt a scoop; it softens the outside and forms a pool of cold, sweet, milky coffee while the core stays frozen. That is the drink part of the dessert, and it is why the contrast survives for a few minutes rather than a few seconds.

It also explains the two common failures. Pour weak coffee in large volume and you have enough heat to melt the whole scoop into a lukewarm milkshake. Pour the shot onto ice cream that is too cold and hard, and the espresso runs off without softening anything.

Gelato or ice cream

Either works, but they behave differently under a hot shot.

Air. Gelato is churned to hold relatively little air. US rules allow ice cream to weigh as little as 4.5 pounds per gallon — about 0.54 g per millilitre, roughly half the density of water — so a light, airy ice cream can be close to half air. More air means less frozen mass in each spoonful, so the same shot melts a very airy ice cream away faster.

Temperature. Gelato is served at −14 to −11 °C. The FDA recommends keeping a home freezer at −18 °C, so ice cream straight from it is colder and harder than a shop's gelato. A few minutes on the counter brings it closer to the right texture, which is why the recipe lets it stand before scooping.

Flavour. Fior di latte or vanilla is traditional because a plain milky base lets the coffee lead. Chocolate, hazelnut and coffee gelato all work too, though they make a sweeter, heavier dessert.

Variations

• With liqueur. A shot of amaretto, the almond-flavoured liqueur from Saronno, is the classic addition; coffee liqueurs such as Kahlúa and other liqueurs are common too. Amaretto is generally 21–28% alcohol, so a 25 ml measure adds 5–7 ml of pure alcohol — up to about 0.7 UK units.
• With a double shot. For two scoops, or a stronger coffee taste, use a double.
• On the side. Biscotti are a traditional accompaniment.
• Without a machine. Use 30–40 ml of strong moka pot coffee or a concentrated AeroPress brew. It needs to be small and hot; a big pour of filter coffee just melts the scoop.

Caffeine and calories

At the USDA's average of 212 mg of caffeine per 100 g of restaurant espresso, a single 30 g shot carries about 64 mg; a double about twice that. Decaf espresso makes an after-dinner affogato without the stimulant, and the coffee and sleep guide explains why that may be worth doing.

The USDA lists vanilla ice cream at 207 kcal and 21 g of sugar per 100 g, so a 66 g scoop comes to about 137 kcal and 14 g of sugar. Gelato varies by maker, so treat these figures as a guide.

Where it came from

No one knows who first poured espresso over gelato. The dessert is thought to have begun in Italian cafés in the mid-20th century, where both were always to hand, and to have spread abroad with café culture late in the century; English dictionaries record the word from 1988. Other spirits and drinks have been poured over ice cream too — whisky, hot chocolate, kirsch, vin santo and port among them — but the espresso version is the one that stuck.

For a frozen coffee you drink rather than spoon, see the iced latte guide, and for the rest of the café menu, the types of coffee drinks guide.