Several locations of fast-food chain A&W Canada have sold out of its newest menu item, the plant-based Beyond Burger. The chain added the burger—served with lettuce, onion, pickles, tomatoes, “Uncle sauce,” and mayonnaise—on July 9 to its 925 Canadian locations. “We are out of Beyond Burgers. Due to a Canada-wide shortage and the extreme popularity of [the burger], we have run out,” the company posted on Instagram. “Many stores may still have them. We will continue serving them as soon as we can get more. Thank you for making our new burger a success.” A representative for A&W Canada has confirmed to VegNews that the chain cannot guarantee that its bun is vegan-friendly due to one ingredient that is derived from either animal or plant-based sources, depending on the time of year. However, when it is back in stock, customers seeking a fully vegan option can order the Beyond Burger at A&W without the sauce and mayonnaise and wrapped in lettuce in lieu of a bun. Last month, Beyond Meat announced that it will open a second facility in Missouri that will triple its production capacity before it expands the distribution of its plant-based products to six continents and more than 50 countries by the end of the summer.