Put the mushrooms in a bowl, pour boiling water over them and let them soak for at least 20 minutes. Then clean and rinse thoroughly. In the meantime, peel and finely chop the ginger and garlic.
Cut the chilli pepper open lengthwise, remove the seeds. Wash the pod and cut into fine rings. Clean lemon grass and cut into fine rings. Clean cabbage, remove stalk. Cut cabbage into fine strips.
Quarter the peppers, clean, wash and finely dice them. Drain the saplings in a sieve. Heat oil in a pot. Briefly sauté the ginger, garlic, chilli and lemongrass. Add paprika, cabbage, mushrooms and saplings and steam briefly.
Pour broth into the vegetables and cook over medium heat for about 20 minutes. In the meantime read out the radish sprouts. Before serving, season the soup with lime juice and soy sauce. Garnish with radish sprouts.