Start by cleaning and gutting the fish, then cut it into portions and sprinkle with salt. Slice the onions into rings and the carrots into star shapes. Pour in 1.5 liters (about 6 cups) of water. Add the fish heads, bay leaves, and peppercorns, cover, and simmer for 15-20 minutes. After that, remove the heads, add the fish back into the pot, and continue cooking for another 30 minutes. Once the fish is tender, stir in the vinegar and adjust the seasoning with salt and sugar to taste. Let it cool in the refrigerator. Before serving, arrange on a plate and garnish with parsley leaves.
Ingredients: 1.5 kg (about 3.3 lbs) of fish, 2-3 onions, carrots, parsley root, 100 g (about 3.5 oz) of vinegar, 3-5 peppercorns, salt, sugar, bay leaves.