Crush the peanuts using a pestle and mortar or pulse a few times in a food processor (to the size of the nubs you get in a shop-bought crunchy peanut butter).
Place the tomatoes, chilli, crushed peanuts and remaining ingredients in a large bowl and mix. Ideally, do this with clean hands to fully combine all the ingredients. Taste and adjust the seasoning, adding more fish sauce or chilli if necessary.
Transfer to a serving dish and garnish with the crispy shallots.
