Begin by marinating the steak. This can be done up to a day ahead of time but should be done at least an hour before cooking the steak.
To an airtight container (or large ziploc bag), add the soy sauce and garlic salt. Add in the flank steak and flip the steak a couple of times to coat it. (Can add more soy sauce if needed to cover the steak).
Refrigerate for at least 1 hour, up to 24 hours, before cooking the steak.
This steak can be seared on the stovetop or grilled, or cooked in a smoker. (If smoking the meat, you'll need to prepare extra time to cook it - we love this in the smoker but it takes a bit longer.)
To sear on the stovetop, set a large pan to medium-high heat for about 2 minutes for it to get hot. Add in 1-2 tablespoons of a flavorless oil, then using tongs, remove the steak from the marinade and sear on each side.The amount of searing time on each side will depend on how thick your flank steak is, and how well done you like your steak. Typically it will be a couple minutes per side. Once cooked, remove from heat onto a large cutting board and cover with tinfoil for 5-10 minutes to let the steak rest. Then chop the steak.
You can add the chopped steak warm to the salad, and you can also chill it and add it cold. Either way is delicious.