What: Impossible Slider Where: Participating White Castle locations nationwide In April 2018, White Castle became one of the first fast-food chains to offer a plant-based meat burger. The company is still experimenting with new flavor combinations featuring a patty made by Impossible Foods, such as the BBQ Impossible Slider it unveiled in April 2019.What: Impossible Whopper Where: 58 locations in and near St. Louis, Missouri (soon to be nationwide) This April, Burger King began testing its new Impossible Whopper at 58 locations in St. Louis, to resounding success. The company plans to release the plant-based burger nationwide by the end of the year.What: Big Vegan TS Where: Germany McDonald's Big Vegan TS meatless burger, manufactured by Nestlé, is now available at the chain's German locations, CNN reported. It has no official plans to expand to the US market.What: Beyond Burger Where: All A&W locations across Canada A&W, the second-biggest burger chain in Canada after McDonald's, announced in June 2018 that it would offer Beyond Meat's plant-based patty at all of its restaurants starting on July 9 of that year. In March 2019, A&W added a Beyond Meat Sausage & Egger to its menu, a sign that the company is continuing to expand its plant-based meat offerings.What: Impossible Burger Where: 40 locations in the United States Hard Rock Cafe has been serving Impossible Burgers at all of its company-owned US locations since December.What: Impossible Burger Where: Select locations The Cheesecake Factory has offered its rendition of the Impossible Burger at select locations since July 2018.What: Impossible Tacos and Bowls Where: All 730 Qdoba locations Impossible Foods' tacos and bowls will be available at all 730 Qdoba locations throughout the US by the end of May, Vox reported.What: Impossible Burger Where: Any Red Robin location in the US Red Robin added the Impossible Burger to the menu at all of its more than 570 locations on April Fools' Day this year. But the chain's relationship with the meatless burger is no joke — you can put the Impossible Burger patty on any Red Robin gourmet burger in lieu of a standard beef patty.What: Beyond Burger Where: 469 participating locations After a test at select locations in October 2017, TGI Fridays added Beyond Meat's Beyond Burger to its menu at 469 locations in January 2018. The Beyond Burger patty can be substituted for a beef patty in any of the chain's burgers.What: Beyond Famous Star Where: Participating locations The Beyond Famous Star cemented its place on Carl's Jr's menu after a successful trial run in January, according to Food & Wine. You can also substitute the Beyond burger patty for any chicken or beef burger menu item.