Soak the rice noodles in coldwater (rice noodles are made from rice flour, which is particularly suited to Oriental cuisine).
Prepare the vegetables: Peel the carrots and the kholrabi and cut into thin slices. Finely slice the Chinese cabbage.
Peel the chop onion. Fry the onion in butter, pour in the soup, add the vegetables, then cook at full power, in a covered dish(takes 9 minutes in the microwave). Add the shrimps to the soup the cook on High for 3 minutes.
Take the noodles out of the water and cut into strips 10cm long, add to the soup and let it simmer (takes about two minutes High in an uncovered dish in the microwave.