What You Are Trying to Do
The goal is microfoam: silky, dense, glossy milk with bubbles too small to see individually. When you pour it over espresso, it integrates with the shot rather than floating on top. Bad steaming produces large bubbles that sit on the surface and create a chalky texture.
Microfoam has two phases: stretching (adding air) and texturing (spinning the milk to incorporate the air into tiny bubbles). Both happen during the same steam wand session, but the sequence matters.
Milk Temperature
Target 140-150F. At this temperature, the lactose in milk has partially caramelized, producing natural sweetness. Above 160F, you scorch the proteins and the milk tastes flat and slightly sulfuric. Below 130F, the milk is warm but lacks the silky texture of properly heated milk.
Use a thermometer for the first 20 to 30 sessions. After that, your palm on the pitcher will tell you when you are close to 150F. The pitcher becomes too hot to hold comfortably at around 140F, which is a useful tactile cue.
The Stretching Phase
Start with cold milk. Cold milk gives you more time to work before hitting temperature. Fill the pitcher to just below the spout for a single drink, or just above the bottom of the spout for a double.
Submerge the steam wand tip just below the milk surface, then open the steam valve fully. Lower the pitcher slightly so the wand tip is at the surface. You want the wand pulling air in at the surface, producing a hissing sound rather than a loud gurgling. If it gurgles, the tip is too deep. If it screams, you are creating large bubbles, raise the pitcher slightly.
Stretch the milk for 3 to 5 seconds for latte art milk, or 8 to 10 seconds if you want more foam for a cappuccino.
The Texturing Phase
After stretching, drop the pitcher to submerge the wand tip deeper and angle it slightly to create a spinning vortex in the milk. The goal is to spin the milk on itself, breaking up any large bubbles and incorporating the air you added into the body of the liquid.
You should see the milk surface rolling like a whirlpool with no large bubbles visible. The pitch of the sound drops from a high hiss to a lower rushing sound. Continue until you hit 140-150F.
Adjusting for Milk Type
Whole milk stretches most easily and produces the most stable microfoam. It is the baseline for learning technique.
Oat milk (specifically the barista formulas from Oatly, Minor Figures, or Califia) steams almost as well as whole milk. Use the same technique. Non-barista oat milk separates and produces inconsistent foam.
Almond milk separates easily and produces foam that collapses quickly. If you must use it, steam to 130F max and pour immediately.
Basic Latte Art: The Free Pour
Once you have consistent microfoam, pour from about 4 inches above the cup to allow the espresso to mix with the milk, then drop the pitcher to the surface of the drink and wiggle the pitcher back and forth as you pour to create a heart or leaf pattern. The wiggle deposits the white microfoam on the surface while the darker espresso frames it.
Latte art is a separate skill from milk steaming. You can produce excellent tasting lattes with no decorative pattern. Focus on microfoam quality first. Patterns follow naturally once the milk texture is right.