Debone the chicken thighs and save the chicken fat. Rub them with 1/2 tsp salt and let sit for about 10 minutes.
While waiting, prep your aromatics: slice the ginger, mince the garlic, cut the green onions, and gently pound the lemongrass to release its aroma.
In a clay pot or thick-bottomed pot, heat the neutral oil over low heat. Add the saved chicken fat and slowly render until the pieces shrink and turn golden. Discard the solids.
Add the sliced ginger and minced garlic. Stir fry until fragrant, then add the rice. Toss to coat every grain with the savory oil. Pour in the chicken stock and add salt if needed. Place the lemongrass and green onion on top, then lay the marinated chicken thighs over everything.
Bring to a gentle boil, then cover and simmer on very low heat for about 13 minutes. Turn off the heat and let it rest, covered, for another 10 minutes without opening the lid.
While waiting, make the dipping sauces:
Ginger scallion sauce: Combine chopped green onion, grated ginger, salt, and chicken bouillon powder in a small bowl. Heat 1.5 tbsp oil until smoking hot, then pour over and mix.
Sweet soy sauce: In a small saucepan, combine soy sauce, chicken stock, and rock sugar. Heat gently until the sugar melts and the sauce thickens slightly. Add Thai chili if you like it spicy.
Once the rice is done, take out the chicken and slice it. Remove the lemongrass, ginger, and green onions from the rice. Fluff the rice gently with a spatula or fork. Serve the chicken over the rice, with both dipping sauces on the side.