While stirring the instant vegetable stock into the water, add any amount of turmeric and / or lemongrass to taste, as well as the juice of the other half lemon. Add everything to the pot and simmer for 25 minutes until the potato cubes are soft.
Then put everything through a sieve and let the pieces of fish steep in the clear broth for about 20 minutes. Put 1/3 of the cooked vegetables back into the soup pot and add a pinch of sugar, salt, pepper and Worcester sauce to taste. Finally, add the spring onions, cut into small rolls, and let them steep briefly (they should still be nice and green and crisp). If you like, you can refine the soup with a tablespoon of cream.
Baguette or fresh white bread tastes best with it.