As he worked long, hard days at a shipyard in Hingham, Massachusetts, during World War II, William Rosenberg was struck with an idea for a new kind of food service. As soon as the war ended, Rosenberg started Industrial Luncheon Services, a company that delivered fresh meals and snacks to factory workers. When Rosenberg realized that most of his business was in coffee and donuts, he quit offering his original service. He found an old awning store and converted it into a coffee-and-donut shop called The Open Kettle. This name was soon changed to the more familiar Dunkin' Donuts, and between 1950 and 1955 five more shops opened and thrived. The company later spread beyond the Boston area and has become the largest coffee-and-donut chain in the world.

Today, Dunkin' Donuts offers fifty-two varieties of donuts in each shop, but the most popular have always been the plain glazed and chocolate-glazed yeast donuts.

Source: More Top Secret Recipes by Todd Wilbur.

Add vanilla, hazelnut, almond and chocolate to coffee, milk, sugar and ice in a blender and you get a hack of Dunkin' Donuts' hit frozen coffee drink. Torani makes hazelnut syrup that's perfect for this recipe—you'll find it near the coffee in your market or in a bar supply outlet. Your drink will come out lighter in color than the real thing—the real recipe may include caramel coloring to darken the drink. This Dunkin' Donuts Coffee Coolatta recipe makes one 24-ounce serving which is called "medium" at the store—or you can split the recipe into two more modest 12-ounce servings.

Source: Top Secret Recipes Unlocked by Todd Wilbur.