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1
Place the steak on your work surface with the long side facing you. Cut the steak into 2 or 3 pieces (do 2 unless the steak is over 12 inches long, then do 3). With the knife at a 45-degree angle, cut each of those pieces into 4 or 5 slices that are about 1/2-inch thick. (If you have a subscription to the CI website, you can find pics of the cutting process here.)
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2
Add the soy sauce, mirin, canola oil, garlic, ginger, sugar, orange zest and the white parts of the scallion in a resealable plastic bag. Shake to combine. Add the meat, press out the air and seal the bag. Refrigerate for at least 30 minutes (but no more than an hour), flipping the bag every 15 minutes to make sure the marinade gets all of the meat equally.
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3
Preheat your grill to medium-high heat (400-450 F). Oil the grates lightly (I use the tongs to hold a paper towel that's been dipped in oil and rub it over the grates).
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4
While the grill preheats make the sauce. Combine all of the ingredients in a small saucepan. Bring the mixture to a boil over medium heat, whisking occasionally, then reduce the heat to medium-low and simmer until the sauce is syrupy, about 12 minutes. The sauce should be reduced to about 1/2 cup. Transfer all but 2 tablespoons of the sauce to a small bowl and set aside for serving.
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5
Remove the meat from the marinade and pat it dry with paper towels. Place the meat on the grill and cook on the first side for about 3 minutes, or until well seared. Flip the steak and cook on the second side for 3 more minutes. Use half of the reserved 2 tablespoons of sauce to brush the top of the meat, then flip and cook for 30 seconds. Brush the second side of the meat with the remaining tablespoon of sauce, flip and cook for 30 seconds longer. Transfer the meat to a plate, tent and let rest for 5 minutes.
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6
Garnish with the green parts of the scallion and serve with the reserved sauce.
