Soak Mu Err mushrooms in cold water for about 30 minutes. Meanwhile bring the stock and soy sauce to the boil. Peel and chop the ginger and garlic cloves. Clean and wash the chillies and cut them into rings.
Clean, wash and chop the lemongrass. Wash the coriander and shake dry.
Add the garlic, ginger, about half of the chillies, lemongrass, coriander and wine to the stock, leave to stand for about 30 minutes. Wash and drain the spinach. Put glass noodles in a bowl, pour boiling water over them and let them steep for 2-3 minutes.
Pour the pasta into a sieve, rinse with cold water and place in a bowl of cold water.
Wash the prawns and pat them dry. Heat oil in a pan. Fry the prawns for approx. 3 minutes, turning, and season with salt and pepper. Pour broth through a sieve into a pot, bring to the boil, add spinach and let it collapse.
Drain the noodles well and add them to the soup with mushrooms and prawns. Arrange soup in bowls, sprinkle with remaining chilli and some pepper.