Bring the rice to the boil in 700 ml salted water, cover and allow to swell over a low heat for about 20 minutes. Clean the shiitake and cut off the stems. Carve heads crosswise with a knife.
Clean and wash broccoli and cut into florets. Peel and wash the carrots and cut them into sticks. Rinse and drain the sprouts. Peel and chop onion. Heat oil in a wok. Fry the onion until transparent.
Add carrots and broccoli and fry for about 5 minutes. Add the shiitake to the wok and fry for another 5 minutes. Add sprouts and deglaze with stock and soy sauce. Simmer for about 3 minutes. Stir in Sambal Oelek and season with salt and pepper.
Serve wok with rice and garnish with coriander as desired.