Mix soy sauce and cornstarch in a bowl. Add sliced tenderloin to bowl and mix. Set aside.
Boil water and add green beans. Cook until tender (time varies a lot with green beans depending on freshness and season). Drain and set aside
Heat a large nonstick pan. Once the pan is heated, add oil, garlic, ginger, and red pepper flakes. Saute for a few minutes. Add pork and stir fry until just cooked on the sides. Add green beans and stir. Add chicken broth and continue to stir fry for a few minutes. Turn down heat and cover pan and cook for another 5 minutes.
Remove from heat and sprinkle cashews on top. Enjoy!