1 pound pork tenderloin, trimmed, halved lengthwise and cut into 1/4-inch-thick pieces
1 medium onion, slivered
1 medium red bell pepper, thinly sliced
3 cups mung bean sprouts (see Note)
1 tablespoon minced fresh ginger
Combine broth, soy sauce, molasses and pepper in a medium bowl. Transfer 2 tablespoons of the mixture to a small bowl; stir in cornstarch until combined. Set aside.
Heat 1 tablespoon oil in a large nonstick skillet over medium heat. Add pork and cook, stirring frequently, until most of the pink is gone, 2 to 3 minutes. Transfer to a plate.
Increase heat to medium-high. Add the remaining 1 tablespoon oil, onion, bell pepper, sprouts and ginger and cook for 3 minutes. Pour in the broth mixture and bring to a boil. Cook, stirring, for 3 minutes. Reduce heat to medium; add the reserved cornstarch mixture and pork (and any accumulated juice) and cook, stirring, until slightly thickened, about 1 minute.