Pound the garlic and chillies in a mortar and pestle until crushed, again until softened.
2. Add the lime juice, fish sauce and palm sugar, and stir until all the sugar is dissolved.
3. Add the beans, green papaya and tomatoes, and pound gently just to bruise and soften the vegetables.
4. Have a taste and adjust the flavour of the salad according to your liking — there should be a balance of sweet, sour, spicy and a little bit of salty.
5. Finally add the toasted peanuts and mix well.