Best-Ever Pepper Steak

Directions

1. 1
   Make sauce: In a medium bowl, whisk the soy sauce with the vinegar, sugar, and cornstarch. Set aside. In a large skillet over high heat, heat 1 tablespoon oil.
2. 2
   Add flank steak, season with salt, and cook until cooked through and seared on all sides, about 8 minutes.
3. 3
   Remove steak to a plate.
4. 4
   Add 1 tablespoon remaining oil and red and green bell peppers to the skillet. Cook until softened, about 4 minutes.
5. 5
   Add the garlic and ginger and cook stirring until fragrant. Return the beef to the skillet and pour over prepared sauce. Cook, stirring, until the sauce is glossy about 2 minutes more.
6. 6
   Serve with rice.