Boil the cod. Pour 1.5 liters of water into a saucepan, add peeled carrots and onions (whole), add bay leaf, salt and black peppercorns. When the water boils, put the cod pieces into the saucepan. Reduce the heat to minimum, cook the fish for 10-15 minutes. Remove the cod from the broth and place it on a plate.
While the fish is cooking, make the sauce. Melt the butter in a frying pan, pour in some fish broth. Add grated eggs and stir.
Proceed to the final stage of cooking cod in Polish style. Place the fish pieces in a frying pan. Distribute so that the sauce evenly covers the cod. Sprinkle chopped herbs on top, turn off the stove and leave the dish to infuse for 4 minutes.