This isn’t iced coffee, which is hot coffee or espresso allowed to cool and then served over ice. Cold-brew coffee is exactly what it sounds like, brewed by steeping coffee in cold water rather than hot. Basically, because the grounds aren’t exposed to hot water, the resulting coffee is thought to be more flavorful and less bitter than hot coffee.
Coffee brewed hot is far more acidic than cold-brewed so switching to cold brew keeps all the benefits of coffee and lessens the bad side effects like stomach problems.
One pound of coarsely ground coffee for one gallon of water.
Put the coffee in a large container. Pour in a gallon of water and give it a good stir after 10 minutes. Cover the container with something breathable, such as cheesecloth, and let it stand at room temperature for 12 to 24 hours.
Set a strainer lined with cheesecloth or a paper filter on top of a clean container and pour in the coffee mixture.
Cover and refrigerate the brew for 4 to 5 days. It’s a concentrate, so when you’re ready to drink, pour some of the brew into a cup and add some cold filtered water. How much you add depends on how strongly you brewed your cold-brew and how strong you like your coffee.