Heat the oil in a wok, add the tofu and cook over a medium heat, turning occasionally, for about 4–5 minutes, until golden. Use a slotted spoon to remove it and set aside. Tip the oil from the wok into a large heavy pan.
Add the stock, chilli jam, kaffir lime rind, shallot, garlic, lime leaves, two-thirds of the chillies and the lemon grass to the pan. Bring to th