AdvertisementHere's Why Environmentalists Are Cheering The Latest Burger At Sonic Drive-InMarch 02, 2018Dan CharlesfacebookEmailThe idea behind the blended beef-mushroom burger is that mixing chopped mushrooms into our burgers boosts the umami taste, adds more moisture and reduces the amount of beef needed. And reducing the need for beef has a big impact on the environment. (The Mushroom Council)