As one of the first U.S. quick service restaurants to offer plant-based meat on its menu, Carl’s Jr. is inviting customers everywhere to get in on the plant-based party, by offering fans the opportunity to try the Beyond Famous Star for free on Thursday, August 15.

In order to receive the offer, fans who say “Beyond Upgrade” with the purchase of any large drink on this day will receive a free Beyond Famous Star, at participating restaurants while supplies last.

First launched in December 2018, Carl’s Jr. and Beyond Meat partnered to be among the first to bring the world this major innovation in quick service—a protein-packed, charbroiled version of Carl’s Jr.’s legendary Famous Star burger featuring plant-based protein. To date, more than 4.4 million Beyond Famous Stars have been sold at Carl’s Jr. restaurants, making it the brand’s most successful burger launch over the past two years.