Barley coffee is a caffeine-free beverage made from roasted barley grains. It is often used as a coffee substitute, providing a similar flavor profile without the stimulating effects of caffeine. The grains are roasted until they reach a dark color, then ground and brewed like traditional coffee. This drink is popular in various cultures, particularly in Italy, where it is known as "caffè d'orzo." Barley coffee can be enjoyed hot or cold and is sometimes sweetened or flavored with milk, making it a versatile option for those looking to reduce their caffeine intake.