Heat the oil in a large saucepan. Lightly fry the shallot and shiitake mushrooms until shallot is soft, then add the lemongrass, galangal, chilli, kefir lime leaves. Fry for 30 seconds.
Add 2 tablespoons of miso, add 1 litre of boiled water, stir until miso is dissolved. Simmer for 10 minutes.
Next add the rice and finely chopped hedge mustard greens and laver seaweed. Stir in well, and simmer for 15 minutes.
Remove from heat and stir in the mirin. Serve immediately.