Combine the fish sauce, lime juice, and palm sugar in a large bowl and stir until the sugar has almost dissolved. Add the grated garlic, peanuts, and the chilies (if using).
Pound the green beans with a rolling pin to make them more tender and also add to the bowl. Add the tomatoes pressing down a little bit with a spoon to release some juice.
Finally, add the dried shrimp and papaya and toss everything together. Enjoy!
Notes
If you will have some leftover papaya, you can add it to stir-fries or anywhere you like actually. Treat it like any other firm veggie like broccoli or carrot. I made veggie pancakes with mine and they were awesome. Recipe adapted from Hot Thai Kitchen by Pailin Chongchitnant. A great book about Thai cuisine!