Toast the pepper over medium high heat in a large pan, stirring constantly for about 2-3 minutes, or until fragrant. Remove to a small bowl and set aside. Do not clean pan.
Transfer a quarter of the pepper into a bowl with the chicken, add the salt and toss to combine evenly.
Heat a tablespoon of oil over medium-high heat in the now empty pan and when hot, add the onion and cook until softened and beginning to brown, about 3-5 minutes. Add the garlic and cook until fragrant, one minute more. Add the chicken, coconut aminos, monk fruit, if using, 2 more tablespoons pepper, fish sauce, and chicken stock. Stir to coat evenly and then simmer covered for about 15 minutes, or until chicken is cooked through.
Uncover and turn the heat up to high, stirring occasionally to reduce the sauce to a few tablespoons, about 5 more minutes. Add the green onions with 2 minutes of cooking remaining. Off heat, stir in lime juice. Season to taste with salt then sprinkle with the rest of the pepper just before serving.