what cut is used for a bavette
Flap Steak, NAMP 1185A, also known as a Bavette Steak or a Bistro Steak is a tougher, more economical steak cut from the flap of the Bottom Sirloin Sub-Primal Cut. The texture, flavor, and handling is similar to that of a Skirt Steak or Flank Steak.
Bavette Steak with Shallots, Garlic, and Thyme. Bavette, a French-style cut, is similar to a flank steak, and kind of like a hangar or skirt steak, but better than any of them--according to Camas Davis, former journalist and founder of the Portland Meat Collective, who loves bavette for its intense flavor and luxurious marbling.