Thaw the fish, cut into portions, salt and pepper. Wash and peel the onions and carrots. Grate the carrots on a coarse grater and cut the onion into half rings. Wash fresh herbs under running water, dry with a paper towel and chop. Prepare the slow cooker.
Fry the vegetables. Grease the multicooker bowl with oil. Turn on the “Frying” program. Add the onions and carrots and cook for 10 minutes, stirring them.
Stew the fish. Add fish to the vegetables, cover with water and sour cream. Turn on the slow cooker timer for 30 minutes.
Place stewed onions and carrots on a plate, place fish on top and garnish with herbs.