Latte

Definition

An espresso-based drink made with roughly one part espresso to five parts steamed milk and finished with a thin layer of microfoam. In Italy caffe latte is a breakfast drink mixed at home, while the cafe latte sold worldwide is a larger, milk-forward beverage usually served in an 8-12 oz cup.

Etymology

Shortened from Italian caffe e latte, literally coffee and milk, by English-speaking cafes in the 1980s. In Italian latte alone simply means milk, so ordering a latte in Rome may get you a glass of milk.

In use

The default milk drink on most cafe menus and the standard canvas for latte art, flavored syrups, and oat or almond milk substitutions.

The Ratio and Why It Varies So Much

The defining feature of a latte is proportion: a lot of milk to a little coffee, usually somewhere between four and six parts milk to one part espresso. A common build is a double shot of about 30 to 40 g of espresso topped with 150 to 200 g of steamed milk in a 240 to 350 ml cup. That milk-forward balance is what separates it from a cappuccino, which uses roughly equal parts and far less total liquid.

In practice the ratio drifts with the size of the cup and with local habit. Australian and New Zealand cafés serve a similar drink as a flat white in a smaller cup with a thinner layer of foam, while a large flavoured latte in a chain café may carry twice the milk of a traditional version with the same espresso. When someone says a latte tastes weak, the dose of espresso relative to the milk is usually the reason.

For anyone brewing at home, the useful habit is to fix the espresso first and then add milk to taste rather than to a fixed volume. Milk is a very effective mask: past a certain point, adding more does not dilute the coffee so much as replace its flavour with the taste of hot milk and sugar.

Steamed Milk and Microfoam

A latte is built on steamed milk, and the skill is in the texture rather than the temperature. A steam wand introduces air into cold milk to create foam, then keeps the milk moving in a vortex so the bubbles are broken down into a glossy, pourable microfoam. The result should look like wet paint: shiny, smooth, with bubbles too small to see individually.

Temperature is the constraint. Milk scalds and its proteins change character above roughly 65 to 70 degrees Celsius, and the sweetness that makes a latte pleasant fades as it climbs toward that range. Most cafés aim to finish somewhere around 55 to 65 degrees, which is comfortable to drink immediately. Before that, the milk has to be cold and the pitcher the right size for the volume, so the wand has room to work.

Milk choice changes the result more than many people expect. Whole milk foams easily because of its fat and protein content, and it produces the most stable microfoam. Skim milk foams readily but gives a thinner, drier texture. Oat, soy and almond drinks vary enormously by brand, and the barista versions are formulated with extra fat or stabilisers specifically to hold foam. Soy has a tendency to curdle in very acidic coffee.

Building the Drink

Work in order. Pull the espresso into the cup you intend to serve, and steam the milk while the shot is running or immediately after, so the coffee does not sit and cool while you work. Milk and coffee should meet while both are still hot, since the foam sets quickly once it stops moving.

Pour in two stages. First raise the pitcher and pour a steady stream through the centre, which mixes milk into the coffee and creates the base layer. Then lower the spout close to the surface and pour the remaining foam more slowly to leave a layer on top. If you want latte art, the second stage is where the pattern forms; if you do not, simply swirl the pitcher before pouring and aim for an even, thin head.

Preheat the cup. A cold mug pulls heat out of a drink that is only around 60 degrees to begin with, and a latte that arrives lukewarm is one of the most common complaints about home-made versions. Rinsing the cup with hot water takes a few seconds and makes a noticeable difference.

Common Problems and Fixes

Big dry bubbles on top mean air was introduced too aggressively or the milk was not rolled long enough afterwards. The fix is to keep the tip of the wand just under the surface for a shorter time and then lower it to create a vortex that folds the foam into the milk. The sound should be a soft tearing hiss for a few seconds, followed by a quieter, steady rumble.

Milk that will not foam usually means the pitcher is overfilled, the steam wand is clogged, or the milk is too old. Milk that foams but will not pour smoothly has been over-aerated. Milk that tastes flat and slightly cooked has been overheated. Each has a distinct fix, which is why tasting the milk on its own is worth doing while learning.

If the drink separates into coffee at the bottom and foam on top, the milk was too stiff to mix. Pouring a thinner, wetter microfoam and swirling it into the coffee as you pour keeps the texture integrated, which is what gives a good latte its uniform, velvety body rather than a cap of dry foam.

Serving, Flavouring and Variations

Flavoured syrups are added to the cup before the espresso, so the hot shot dissolves them and the milk mixes everything together. Vanilla, caramel and hazelnut remain the standard trio, with seasonal variations following local taste. Adding syrup before the coffee also means the drink does not need stirring at the table, which is why cafés build it that way.

A latte macchiato inverts the construction: milk goes in first and the espresso is poured through it, producing layers that the drinker stirs together at the table. An iced latte is typically built with cold milk over ice and a hot shot poured on top, though chilling the espresso first produces a cleaner drink and slows the ice from melting.

Because the milk dominates, a latte is a forgiving place for a coffee that is not at its best. Coffees with strong chocolate, nut and caramel notes work well; very delicate floral coffees tend to be lost. That is a large part of why cafés so often pair a fairly dark, sweet espresso blend with milk and keep their single-origin offerings for filter.