Two ways of preparing instant coffee concentrate are extraction and freeze-drying. In both the process of extraction and freeze-drying, water is sprayed onto the coffee grounds, which are then steeped in hot water for a few minutes, forcing the coffee grinds deep into the liquid. This creates a coffee concentrate. An extraction process uses a pressurized bottle, like the kind used for hot chocolate, to "pour" the concentrate into a container, which is then heated. Freeze-drying uses liquid nitrogen to "freeze" the concentrate.
Two ways of preparing instant coffee concentrate are extraction and freeze-drying. In both the process of extraction and freeze-drying, water is sprayed onto the coffee grounds, which are then steeped in hot water for a few minutes, forcing the coffee grinds deep into the liquid. This creates a coffee concentrate. An extraction process uses a pressurized bottle, like the kind used for hot chocolate, to "pour" the concentrate into a container, which is then heated. Freeze-drying uses liquid nitrogen to "freeze" the concentrate.