Fisherman's springtime sacrifice
From UnReal World Wiki
When first fish of the spring are caught out at a lake in open water season, make a fish soup or boil them right after returning on shore. When it's cooked, go away from the pot so that the spirit of the water can have the first taste.
Fisherman's springtime sacrifice is a type of spell performed in spring after the ice over water is gone. The first fish caught at a lake can be boiled straight away or made into a soup for spirits of water to taste. A pot is required for boiling or making soup.