Try this Maggie Unzueta recipe, or contribute your own.
Allowing flap steak to marinate for a minimum of four hours transforms the dense muscle fibers by breaking them down with citrus acid from fresh limes. Combining ground cumin, paprika, oregano, and finely minced garlic directly in the oil base creates a cohesive lipid carrier that distributes fat-soluble aromatic compounds evenly across the meat surface. Extending this refrigeration window to overnight deepens the flavor penetration without over-curing the protein. Tempering the meat on the counter for twenty minutes prior to cooking prevents the cold interior from seizing when exposed to direct heat. Maintaining the grill at a steady 350 degrees Fahrenheit ensures the exterior develops a savory crust before the interior overcooks. Monitoring internal doneness with a digital thermometer removes guesswork, targeting roughly 130 degrees Fahrenheit for medium-rare results. Tongs provide tactile feedback during the grill process, yielding a firm resistance when touched once the protein reaches optimal doneness. Resting the grilled steak beneath a loose foil tent for ten full minutes allows internal juices to redistribute evenly throughout the muscle matrix rather than escaping onto the cutting board. Slicing the protein across the grain rather than parallel to it shortens the muscle fibers, producing a tender bite on the plate. Swapping flap steak for flank steak requires identical cooking durations, though skirt steak cooks significantly faster due to its thinner profile and higher fat content.