How to make it
Combine stock, soy sauce and brown sugar in a medium bowl. Add a few grinds of fresh black pepper. Transfer 2 tablespoons of the mixture to a small bowl; stir in corn starch until combined. Set aside.
Heat 1 tablespoon sesame oil in a large nonstick frying pan or wok over medium heat. Add pork and cook, stirring frequently, 2 to 3 minutes. Transfer to a plate.
Cook vermicelli according to packet instructions and set aside.
Increase heat to medium-high. Add the remaining 1 tablespoon sesame oil, onion, capsicum, sprouts and ginger and cook for 3 minutes. Pour in the soy mixture and bring to a boil. Cook, stirring, for 3 minutes. Reduce heat to medium, then add the pork and any remaining juice. Follow with the vermicelli, snipping with scissors for ease of stirring. Cook for a couple of minutes then serve.