Heat a large wok over high heat.
Add the peanuts, stir constantly, and reduce the heat to medium-low after around a couple of minutes.
Once the peanuts start to colour (after about 5 minutes), turn the heat to low.
Keep stirring and add the oil slowly.
Add the five spice powder, salt and the sugar and stir well.
Add the chillies.
The nuts are fully roasted when they are bright red. A little bit of brown is good too. Add the kaffir lime leaves.
Remove the nuts from the wok and place on an oven tray lined with greaseproof paper and allow to cool.
Serve with some Vietnamese beer!