Proctor and Gamble announced Tuesday the voluntary recall of all cans of taco- or cheeseburger-flavored Pringles. The chips contain the flavor ingredient hydrolyzed vegetable protein that has been found to contain salmonella. The chips are some of many “ready-to-eat” products that are being recalled due to salmonella because their manufacturing process does not include a “kill step,” which would eliminate the salmonella bacteria.