Thai red chilies and garlic cloves should be added to the mortar and pestle. Make a rough paste by pounding. Once the palm sugar has dissolved, add the remaining ingredients—all but the salmon bellies—and well combine.
Put the marinade in a big basin. Using tongs, add the salmon bellies to the bowl and combine with the marinade. Allow it to rest for 15 to 20 minutes. Put the bowl in the refrigerator if you plan to marinate it for a longer period of time.
For about 2 minutes, preheat the air fryer to 390F. Make a single layer of salmon bellies. As long as the salmon bellies are completely cooked, air fry for 5 to 7 minutes.