Subway will launch a test of sandwiches made with plant-based meatballs from Beyond Meat at 685 restaurants in the United States and Canada next month. Other chains including Dunkin’, Hardee’s and Tim Hortons have added Beyond Meat products to the menu, and Burger King is expanding its Impossible Whopper from Impossible Foods to all of its U.S. restaurants.

Shares of Beyond Meat, which sells its plant-based burgers and sausages at restaurants and in supermarkets, rose 4 percent in premarket trading. They have soared 545 percent since their IPO in May.

Plant-based meat alternatives have seen booming interest from consumers and restaurants, supporting startups like Beyond Meat and its competitor Impossible Foods, and even sparking interest from veteran meat companies such as Tyson Foods Inc and Perdue Foods.

Blue Apron last month said it would also add Beyond Meat’s plant-based burgers to its meal-kits.