Dunkin's iced coffee is one of the chain's most popular coffee drinks. While other coffee chains like Starbucks typically add two tablespoons of coffee for every six ounces of water, Dunkin adds three tablespoons.

According to the company blog, since the ice added to cold espresso drinks dilutes the coffee, it is essential to double the beans. This extra caffeine gives a rich coffee flavor and allows customers to get the most bang for their buck.

This formula, combined with Dunkin's 100% ethically-sourced Arabica Beans, makes its coffee taste strong and flavorful. Thrillist even ranked Dunkin’s iced coffee as the number one brand in the country.