If You Aren't Ordering This Iced Coffee Flavor At Dunkin' You're Doing It Wrong Delish 2 hrs ago Replay Video UP NEXT Warmer days are finally here, and with them comes iced coffee season. To prepare you for the sweltering days ahead, we decided to taste test and rank all of Dunkin' Donuts iced coffee flavors —from traditional mocha to out-there rocky road. We judged (from best to worst) on overall taste, but also if the coffee actually tasted like the flavor it was purporting to be. We were also curious what made a flavor a "swirl," so we reached out to Dunkin' Donuts, and got this response from Jeff Miller, Dunkin' Brands' executive chef and vice president of production: