Dunkin' Donuts' Cold Brew coffee is made with their own special blend of coffee steeped in cold water for an extended period of time. The chain describes the taste as a "rich, smooth coffee with an inherently sweeter flavor reminiscent of dark chocolate."
You can find the coffee in small, medium, and large cup sizes.
Cold Brew coffee has caught on of late at some major fast food chains (notably at Starbucks and Chick-fil-A).
Image via Dunkin' Donuts.