Amongst these, Sonic Drive-In has emerged as a key innovator with their Signature Slinger. A 25-75 blend of mushroom and beef that boosts flavor while providing a healthier option, the Slingers have found popularity within Sonic's mainstream consumer base. The response so far has been "overwhelmingly positive," according to representatives, with a majority of those who try it once saying they would order it again. Sonic has even given the burger an extended stay as part of their $2.99 Carhop Classic deal, confirming that the blended mushroom burger is resonating amongst consumers.