Burger King’s latest new item is taking a stab at Chipotle Mexican Grill Inc. The Whopperito, which puts Whopper burger ingredients such as beef, tomatoes, onions, lettuce and pickles in a flour tortilla, will be sold nationally beginning Aug. 15. A queso sauce replaces the mayonnaise from the hamburger. “It’s certainly one of the first times that we’ve tapped into the Tex-Mex category,” Alex Macedo, North American president at Burger King, said.