In a development echoing last year's chicken sandwich wars, Tyson Foods, Inc. (NYSE: TSN) threw down the gauntlet to noted plant-based meat-maker Beyond Meat and privately held Impossible Foods with its first U.S. launch of its "Unchicken sandwich." Notably, the offering, which uses plant-based chicken from Tyson's Raised & Rooted faux-meat brand, features pea protein isolate in the Unchicken filets. While Beyond Meat highlights the use of pea and potato protein rather than soy in its Beyond Burgers, its Beyond Fried Chicken experiment made use of wheat and soy protein.