Cook quinoa or whole grain of your choosing and set aside to cool.
Preheat large cast iron pan to medium-high heat.
Liberally season flat iron steak with salt and pepper on both sides.
Pan sear flat iron steak: cook for at least 4 minutes on each side. Cook to medium rare or desired doneness. Once cooked, remove from heat and set aside to cool/rest before slicing.
Combine cooled grain with the remaining salad ingredients in a large bowl and toss to coat. Season with salt and pepper if desired.
Evenly distribute the salad among 4 bowls or plates.
Top each salad with 5 oz. of cooked flat iron steak (slice against the grain to retain the juices). Enjoy!