The Pumpkin Spice Latte is a coffee drink made with a mix of traditional fall spice flavors (cinnamon, nutmeg and clove), steamed milk, espresso, and often sugar, topped with whipped cream and pumpkin pie spice. Since 2015, it has also contained a small amount of pumpkin puree. The drink is offered by Starbucks and many other cafés on a seasonal basis, usually available from late August through January.
In 2017, Ana-Gabriel Perez and friends developed an esoteric programming language for girls, called Pumpkin Spice Latte, based around Starbucks drink sizes and more.
Starbucks started developing the Pumpkin Spice Latte in January 2003 following the successful introduction of winter seasonal drinks such as the Peppermint Mocha and Eggnog Latte. According to Peter Dukes, Starbucks' director of Espresso Americas, developers tested ten products with consumers, with the Pumpkin Spice Latte coming out in the middle of the group after chocolate and caramel flavors. Dukes said that "developers realized there was something special around the pumpkin flavor, especially since there wasn't anything around pumpkin at the time". The company experimented with different combinations and ratios of pumpkin to spice, ultimately deciding on a recipe with no pumpkin in it.
In fall of 2003, the final recipe was tested in Vancouver and Washington, D.C. Sales of the drink exceeded the company's expectations: Dukes said "we couldn't keep up initially... we had to expedite inventory to the stores." The product went on sale in all U.S. Starbucks stores the following year.
The company said that Pumpkin Spice Latte was Starbucks' most popular seasonal beverage, with more than 200 million sold between its 2003 introduction and 2015. The beverage started a trend of pumpkin spice products, such as candles and air fresheners, as well as for foods as diverse as donuts, breakfast cereals, cough drops, and pasta sauce.
In August 2015, Starbucks changed the recipe to include pumpkin and remove artificial colors. The ingredients announced included a "pumpkin pie flavored syrup" made with sugar, condensed skim milk, pumpkin puree, coloring and preservative.
According to wikipedia