Cold Foam at Home: Citrus and Matcha Variations

Cold foam adds an airy milk layer to iced coffee without steaming. CoffeeBox's method begins with a small quantity of chilled milk—less than 100 millilitres is a manageable starting batch—in a container with room for expansion. Use a handheld frother according to its instructions for roughly 30–60 seconds, stopping when the texture is fine and spoonable rather than chasing maximum volume.

For a citrus version, add a little food-safe orange or lemon zest, or a small quantity of citrus syrup, before frothing. Keep the amount modest and avoid substituting a large quantity of acidic juice. For matcha foam, first mix matcha smoothly with a little water, then combine it with cold milk and sweetener if wanted before aerating.

Spoon the foam over cold brew or an iced black coffee and serve promptly. Milk type and formulation affect foam stability, so adjust within the product's guidance. Keep dairy or plant milk refrigerated before preparation and clean the frother after use. These are source-based variations, with no independently tested shelf life or guaranteed foam duration.