How do I froth milk for a latte?

Frothing milk is a skill that bridges the gap between a simple coffee drink and a café-quality experience. The goal is to create 'microfoam'—a texture where the bubbles are so small they are invisible to the naked eye, resulting in a liquid that looks and feels like wet paint. This texture is what gives a latte its signature sweetness and creamy mouthfeel.

Start with cold, fresh milk. Cold milk gives you more time to work with the steam wand before the temperature rises too high. Pour the milk into a stainless steel pitcher, filling it just below the spout. Submerge the tip of the steam wand just below the surface of the milk. When you turn on the steam, you should hear a gentle 'paper-tearing' sound. This is the aeration phase, where you are introducing air into the milk to create the foam.

Once the milk has expanded by about 30% to 50% and the pitcher feels warm to the touch, submerge the steam wand slightly deeper and tilt the pitcher to create a whirlpool. This vortex is essential; it breaks down the larger bubbles created during the aeration phase and folds them into the milk, creating that smooth, velvety microfoam. Continue this until the pitcher is too hot to hold comfortably, usually around 140°F to 150°F.

Temperature control is vital. If you overheat the milk, you will scald the proteins and sugars, resulting in a flat, 'cooked' taste that masks the flavor of the espresso. If you under-heat it, the foam will be thin and lack the necessary sweetness. A good rule of thumb is to stop steaming when the pitcher becomes uncomfortable to touch for more than a second.

In practice, technique is everything. After steaming, give the pitcher a firm tap on the counter to pop any remaining large bubbles, and swirl the milk to keep it glossy. If you are practicing latte art, pour the milk steadily into the center of your espresso shot. The key is consistency; practice is the only way to master the timing of the aeration and the whirlpool. With time, you will be able to produce perfect microfoam every single time.