1½–2 lbs beef strips (flank steak or sirloin)
1 green bell pepper, sliced
1 red bell pepper, sliced
1 onion, sliced
3–4 cloves garlic, minced
1 cup beef broth
1/4 cup soy sauce
2 tablespoons brown sugar
1 tablespoon cornstarch
1 teaspoon ground ginger (or fresh grated)
1/2 teaspoon black pepper