If it seems as if pumpkin spice season comes earlier each year, you're not imagining things. Pumpkin spice lattes have officially arrived at Starbucks, making their earliest ever debut. But before you order a cup, drink this in: The flavor can be composed of more than 300 elements—and pumpkin isn’t one of them.

So just what is pumpkin spice if it's not pumpkin? Most recipes include cinnamon, nutmeg, allspice, ginger, and vanilla, but not every incarnation of the concoction is the same, according to the below video by Kantha Shelke, Ph.D, C.F.S., a food scientist and longtime member of the Institute of Food Technologists.

So what’s the connection to the season’s most beloved orange fruit? (Yes, pumpkin is a fruit!) Flavor companies also add in skillfully designed compounds that mimic the taste of pumpkin pie. Each chemical is carefully reviewed by the U.S. Food and Drug Administration and approved at concentrations of about 20 to 50 times the normal consumption level. And even though the full flavor contains 340 compounds, combining only five to 10 percent of those molecules in a mix is enough to trick our brains into thinking, “Mmmm, tastes just like Thanksgiving!”

But beware: Attempting to recreate the magic of pumpkin spice in the average kitchen isn't as easy as pie. With only the spices available at a supermarket, the final product will likely taste more like Chai than the seasonal treat found on professional menus. “Pumpkin Spice isn’t set in stone,” Shelke says. “Everyone has their secret recipe.”

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