Peel the green skin off the papaya and disguard. Shred the papaya fruit using a shredder, mandoline or knife (the shreds should be thin and long). Do not get too close to the seeds where the fruit is bitter.
Using a clay mortar and wood pestle, pound the chilies and garlic until they’re broken up. Add the palm sugar and pound to help disolve.
Add the roasted peanuts and pound to break them up slightly.
Add the lime juice and fish sauce. Incoporate everything together.
Add the long beans, shredded papaya, and tomato, gently pounding until vegetables are slightly bruised. Use a large spoon to incorporate all ingredients together as you pound.