Lay the pork fat-side down on a cutting board and score the meat deeply in a cross-hatch pattern with a sharp knife.
Sprinkle the chicken bouillon powder and the tamarind soup base all over the surface to season well.
Rub most of the chopped garlic into the surface of the meat, pressing it down into the scored cuts. Do the same with the galangal.
Trim the root end and the woody leaves off of the lemongrass, then crush it with the back of a knife. Lay the lemongrass down the length of the belly with the ends sticking out beyond the edge of the pork, and sprinkle the lime leaves around on it.
Roll the pork along its long axis, pinning it together with skewers. Tie between each skewer with butcher's twine, then remove the skewers.
Thread the rotisserie spit through the belly roll.
Insert RFX MEAT into the pork belly up to the recommended immersion line. Make sure it is attached to your RFX GATEWAY and open your ThermoWorks app. Set the high-temp alarm to 195°F (91°C).
Cook the pork
Prepare your rotisserie and place the spit on the rotisserie and start cooking.
While the pork cooks, prepare the basting oil. Put the trimmings from the lemongrass, the rest of the garlic, a few more lime leaves, and some galangal in a small pot with the oil. Bring to a gentle simmer and let it cook about 3 minutes. Strain it into a bowl.
Cook the pork belly, basting it every 30 minutes with the oil. Keep an eye on your fire and maintain it by adding wood or coals as necessary.
When the high-temp alarm sounds on your app, stop the rotisserie and verify the temperature with your Thermapen ONE. If you don't find any temperatures below 195°F (91°C), remove the spit from the rotisserie.
Take the spit out of the pork, pull out the lemongrass stalks, and slice the meat.