A returning beer from Dogfish Head Craft Brewery incorporates a unique brewing method.

Chicha is a 3.1 percent ABV ale created in part by having the brewery staff chew up and spit out purple Peruvian corn. By doing this, the natural enzymes in human saliva converted the starches in the corn into fermentable sugars. Then, after sterilization, the wort of the traditional Latin American corn beer was chilled and blended with strawberries.

“Chicha is one of the most unique beers we brew at Dogfish and each batch has its own special story,” said Sam Calagione, co-founder and president at Dogfish Head, in post on the brewery’s website. “I’m especially excited about this year’s Chicha as I stood shoulder-to-shoulder with my co-workers chewing purple corn and spitting it into cups to create the most physically-collaborative batch of beer we’ve ever brewed.”

The ale debuted in 2009 and has been rereleased multiple times since then, but this is the first time it has been packaged.

According to a press release, the newest version of Dogfish Head’s Chicha will be packaged in 750ml bottles ($18) and will have a two bottle per person purchase limit with 200 bottles available when it goes on sale at the brewery on March 10.