1.
Combine 1/2 teaspoon cornstarch, 1/2 teaspoon sugar, salt, and flank steak in a medium bowl; toss to coat. Set aside.
2. Combine
2 teaspoons cornstarch, 1/2 teaspoon sugar, broth, soy sauce, and black
pepper, stirring with a whisk until sugar dissolves; set aside.
3. Heat
oil in a wok or large nonstick skillet over medium-high heat. Add the
green onions, ginger, and garlic; stir-fry 10 seconds. Add beef
mixture; stir-fry 3 minutes or until done. Remove the beef mixture from
pan; cover and keep warm.
4. Add peas and bell peppers to pan; stir-fry 4
minutes or until crisp-tender. Add beef and broth mixture to pan; cook
2 minutes or until thickened, stirring constantly.