Gardenburger's the brand name of a veggie burger. The company makes a variety of vegetarian and vegan products and meat substitutes. According to the company's website, the original Gardenburger's made from mushrooms, onions, brown rice, rolled oats, cheese, and spices. Gardenburger's a registered trademark of the Wholesome and Hearty Foods Company. Although all Gardenburger products are vegetarian, some of them aren't vegan and include animal-derived ingredients such as eggs or dairy products,… (More on Gardenburger)