Combine chicken with Golden Mountain Sauce and sugar; set aside.
If using day-old rice (see note), transfer to a medium bowl and break the rice up with your hands into individual grains before proceeding. Heat 1/2 tablespoon (7ml) vegetable oil in a wok over high heat until smoking. Add half of rice and cook, stirring and tossing, until the rice is pale brown and toasted and has a lightly chewy texture, about 3 minutes. Transfer to a medium bowl. Repeat with another 1/2 tablespoon oil and remaining rice.
Heat a wok over medium-high heat, coat bottom of the pan with oil, add marinated chicken and let brown on one side. Once browned, toss the chicken and cook until done. Remove from pan and set aside.
Add onion and Chinese broccoli stems and sauté until the onion is translucent.
In the same wok, add a little more oil to coat the bottom, and heat over medium-high heat. Add garlic and chilis and sauté until lightly browned, remove from pan.
Add eggs, break the yolks, and let the egg set about half way then scramble briefly. Add rice and toss briefly, breaking up big lumps with the back of your spatula.
Add all sauce ingredients and toss, breaking up lumps, until the rice is evenly coated in the sauce and the grains are all separated.
Add the vegetables, garlic, chilis, and chicken back into the wok.
Add the green onion and Chinese broccoli leaves and toss just to wilt the leaves.
Add salt and pepper to taste.
Serve immediately with a lime wedge and topped with chopped cilantro.