As the broccoli starts working, start the chicken: Place a large non-stick skillet over medium-high heat with 2 turns of the pan of vegetable oil, about 2 tablespoons. When the oil ripples, add the chicken, spreading it out in an even layer. Let it completely brown up on one side, you will have to resist the urge to stir it for about 2-3 minutes. Give the skillet a shake, stir and continue to cook and brown the chicken for 5 minutes. Remove chicken from skillet to a plate and reserve. Return the skillet to the heat, add 1 more turn of the pan of vegetable oil, about a tablespoon. Once oil ripples, add onion, garlic, red bell pepper, red pepper flakes, ground coriander and some salt and pepper. Cook, stirring frequently, for 2-3 minutes.
In a small bowl, combine the orange juice and hoisin sauce. Add the mixture to the skillet with the veggies along with the sliced water chestnuts and the reserved chicken. Stir to combine and add in the remaining 1/2 cup of chicken stock and the blanched broccoli florets. Cook the veggies and chicken together for about 2 minutes, or until everything is nicely coated and cooked through. Add the cashews and the cilantro or parsley and remove from heat.
Remove the lid from the rice pot and fluff the rice with a fork. Serve orange cashew chicken with a spoonful of rice on top of each portion.