[header] How to foam milk [title] Fill a jam or mason jar with cold milk. [step] Fill the jar with as much milk as you like in your drink. However, since you need room for the milk to expand and foam, do not fill the jar more than halfway with milk.
[substeps] Use 2 percent or non-fat milk since these are easier to froth. [title] Shake the jar for 30 to 60 seconds.