Flank steak (aka Jiffy steak or London broil) comes from the lower chest of the steer, just below the bottom sirloin (where the flap is) but behind the plate and ... to let your meat rest for ...
Like skirt steak, flap meat has a more bold ... flank, brisket, short plate, and shank — come a variety of steaks with names ...
Bottom sirloin is chewier and leaner and can appear as tri-tip, flap steak or under the general label of "sirloin steak." Food & Wine gives you dozens of sirloin recipes from all over the world.