1 cup Soy Sauce
1/2 cup water
2 Cloves Garlic
2" fresh peeled ginger
2 Tbs Splenda
1 Tbs Mirin (rice wine)
1 bunch green onions (scallions)
Now, the trick to cutting flank steak the right way, across the grain, and getting it really thin is this: put it in the freezer until it just begins to get stiff, not hard frozen or you'll never get a knife through it. If you have an electric knife this job will fly!
When ready to cook I spray a big skillet with Pam or just barely coat with olive oil. Grab a handful of the beef, squeeze out the marinade, then brown the meat on medium high heat with space in between every piece so they won't just steam in the released juices. That brown coating is so much of the flavor in this recipe. I flip every piece separately to get a good brown but watch closely and take them out just as soon as they're cooked through. This is the closest way to imitate wok fried beef with oil, without using the oil.By the second or third pan full the dark fond is developing on the bottom of the pan. Adjust the heat a bit lower if this starts to darken too much. And each time you add a piece of meat and it immediately releases some juices, push it around to let those juices bring up the fond to brown the meat. Flavor, flavor, flavor!
As soon as the last meat comes out of the skillet, pour in the remaining marinade and 1/2 cup water and bubble it on high, scraping the bottom well. Add a big handful of green onion tops now. (Use one bunch of green onions and cut the green tops into 2-3" pieces. Save the white part for another recipe.) Let those soften up as the sauce boils down for maybe 4-5 minutes. I like to thicken the sauce for the last few minutes with a spoonful of cornstarch dissolved in about 1/4 c of water. Pour this over the beef and prepare to swoon!