Method:
Place tamari in a small bowl with pork, toss to coat and set aside. Whisk together broth, vinegar, cornstarch, ginger and garlic in a separate bowl and set aside.
Heat a large skillet over medium-high heat. Add pork and cook, stirring, until cooked through, 2 to 3 minutes. Remove pork and juices to a bowl, cover and keep warm.
Add 1/4 cup water to the skillet and bring to a simmer. Stir in asparagus, pepper and green onion. Reduce heat to medium and cover. Cook 5 minutes, uncover and continue to cook until asparagus is fork tender, 2 to 3 minutes. Transfer vegetables to bowl with pork. Whisk broth mixture and add to skillet. Bring to a boil over medium-high heat and boil 1 minute, stirring. Add pork and vegetables back to skillet and stir to coat and heat through. Serve with brown rice.