cold foam is milk whipped with air until it becomes light enough to float on an iced drink. it is not the same thing as steamed milk, and it is not whipped cream.
steamed milk uses heat and air to create a silky texture. cold foam stays cold. whipped cream contains much more fat and is beaten until it becomes thick enough to hold peaks. cold foam should still be pourable.
what milk works best?
low-fat dairy milk often makes a surprisingly stable cold foam because its proteins help trap air and its lower fat content keeps the foam light. whole milk tastes richer but may make a looser foam.
plant milks vary by brand. “barista” versions often foam better because they are formulated for coffee. oat milk can produce a creamy texture, while some almond milks create larger bubbles or separate quickly. cold milk generally foams better than warm milk for this job.
the easiest method: handheld frother
pour cold milk into a tall container, leaving plenty of room for it to expand. start with about 1/4 cup for one drink.
place the frother just below the surface and run it for 20 to 30 seconds. move it slightly up and down, but keep the whisk mostly submerged so you don’t spray milk everywhere.
stop when the milk has increased in volume and looks smooth. tap the container on the counter to pop big bubbles, then swirl it. pour it over an iced coffee, cold brew, or iced matcha.
french press method
add cold milk to a clean french press, keeping it below the halfway mark. move the plunger up and down quickly for about 20 to 30 seconds. the milk will expand, so don’t overfill the press.
let the foam rest for a few seconds, then swirl and pour. this method can make a lot of foam at once, which is helpful if you’re making two drinks.
jar method
pour cold milk into a clean jar, fill it no more than halfway, close it tightly, and shake hard for 30 to 60 seconds.
this creates foam, but the bubbles are usually larger and the texture separates faster than foam made with a frother or french press. it still works when you have no special equipment.
automatic frother method
some electric frothers have a cold setting. use that setting rather than the heating cycle and stay below the machine’s maximum foam line. the exact button and capacity depend on the model, so check its instructions.
how to flavor it
add a small amount of syrup, vanilla extract, or sweetener before frothing. start with less than you think you need. sugar and thick syrups can change how easily the milk foams.
for matcha cold foam, sift a small amount of matcha into the milk before frothing. matcha clumps easily, so whisking it first with a spoonful of water can make the foam smoother.
for chocolate foam, use a little cocoa powder or chocolate syrup. sift cocoa powder to avoid dry pockets.
why is my cold foam disappearing?
all foam starts separating eventually. if yours collapses immediately, the milk may not have enough protein, the container may be greasy, or the bubbles may be too large.
use a clean container with no oil residue. start with very cold milk. keep the frother near the surface at first to add air, then move it slightly deeper to make the bubbles smaller.
if the foam is stiff and spoonable, you may have added too much air. if it is still completely liquid, keep frothing or try a different milk.
food safety matters
cold foam is still milk. keep it refrigerated until you use it, and don’t leave it sitting out for hours. make only what you plan to drink. if the milk smells sour, has changed texture, or has been left at room temperature too long, discard it.
how to build the drink
fill the glass with ice, add coffee or matcha, and leave room at the top. pour the cold foam slowly over the back of a spoon if you want a more defined layer. drink it through the foam instead of stirring right away.
the point is texture, not a perfect cloud. if it tastes good and gives the top of your drink a soft, creamy layer, it worked.