How to make
Cut the fillet and season it with vinegar and salt. Finely chop the carrots, onions and celery and stew them in the fat.
Then pour 4 cups of water over them and bring them to a boil. Mix the flour with 1/2 cup of water and add it to the vegetables.
Once the vegetables have boiled for a few minutes, add the fish and spices. Leave the fish soup on the heated hob for another 5 minutes and sprinkle it with parsley.
