Clean and trim the mushrooms. Clean, wash and cut spring onions into rings. Peel and chop onion and garlic. Remove the outer leaves from the lemon grass. Tap the lemon grass a little bit and cut it into pieces.
Clean, wash and cut the chilli pepper into rings, removing the white seeds. Heat 1 tsp. oil in a pot. Sauté onion, garlic, chilli and lemongrass in it until transparent. Stir in the curry paste and continue steaming for about 1 minute.
Deglaze with coconut milk and broth, bring to the boil and simmer for about 5 minutes. Heat 1 teaspoon of oil in a small, coated frying pan. Press the sausage meat out of the skin as small dumplings and fry it all around in the hot oil.
Add the mushrooms and fry everything for 4-5 minutes. Wash the coriander, dab dry, pluck the leaves from the stalks. Add meatballs, spring onions and mushrooms to the soup, bring to the boil again, season with salt, pepper and a little sugar, arrange and sprinkle with coriander.