In a large bowl with a lid or a large ziplock bag, combine the meat with the water, sesame oil, soy sauce, garlic, powder, and onion powder. Stir or squish to combine, then set aside for 20 minutes to marinate.

While the meat marinates, make the sauce in a small bowl by combining the chicken broth, ketchup, apple cider vinegar, sugar, garlic, ginger, salt, and the white parts of the green onions. Whisk well. In a separate bowl, combine the cornstarch and water, then set both aside.

Once the meat has had a chance to absorb the flavors of the marinade, sprinkle with the salt and pepper, then add the cornstarch and shake well until each piece of meat is evenly coated with a light layer of cornstarch.

Heat the oil in a large skillet or cast iron pan over medium-high heat. When the oil is hot, add the meat in a single layer. Let it cook without moving or stirring the meat for 2-3 minutes until nicely browned on the bottom. Flip each piece of meat with tongs and cook on the other side for another 2-3 minutes until nicely browned and the meat is cooked through. Transfer to a plate.

There should be about 1 tablespoon of oil left in the bottom of the pan from cooking the pork. If not, add a little more oil. Add the peppers and onions to the pan and stir-fry over medium-high heat for 1-2 minutes.

Add the pineapple and sauce and let this cook until the sauce comes to a simmer. Give the cornstarch and water mixture another good stir, then drizzle this slurry over the vegetables and sauce, stirring until the sauce has thickened slightly.

Return the pork to the pan and toss with the sauce, vegetables, and pineapple until everything is coated in the sauce. Sprinkle with the reserved green parts of the chopped green onions and serve with rice.