Soy-Ginger Flank Steak

vegetable or canola oil

⁄2 tablespoons finely grated peeled fresh ginger

minced garlic

⁄3 cup low-sodium soy sauce, or 1⁄2 cup regular soy sauce and

water

⁄2 cup lightly packed light or dark brown sugar

⁄2 teaspoon red pepper flakes (optional)

flank steak (21⁄2 to 3 pounds)

Freshly ground black pepper

Thinly sliced scallions, both white and light green parts (optional), for serving

Lime wedges, for serving

Hot cooked rice, for serving