Cold brew or cold press refers to the process of steeping coffee grounds in room temperature water for an extended period. It is also sometimes referred to as Toddy coffee which is a trademarked cold brewing system. The cold-press process requires grinding coffee beans at a relatively coarse setting (typically as fine as possible to still be filtered) and soaking those grounds in cold water for a prolonged period of time, usually 12 hours or more. The grounds must be filtered out of the cold water after they have been steeped using a paper coffee filter, a fine metal sieve, or a French press.
The result is a coffee concentrate that is often diluted with water or milk, and can be served hot, over ice, or blended with ice and other ingredients such as chocolate. Cold brewed coffee naturally seems sweeter due to its lower acidity. Because the coffee beans in cold-press coffee never come into contact with heated water, the process of leaching flavor from the beans produces a different chemical profile than conventional brewing methods. Cold brew coffee is a type of iced coffee, but this latter term also refers to coffee that is brewed hot and then chilled.