Prepare the products. Fish (clean fillet without bones) cut into pieces, salt, pepper, sprinkle with lemon juice. Dip them in flour and fry on both sides. Prepare the marinade. Cut onion into strips and fry in vegetable oil. Carrot RUB on a grater and also fry. Tomato saute in butter. All mix, add the liquid and simmer until tender. Bring to taste - salt, sugar, vinegar, spices added according to your taste. Many people do not drink vinegar, but you may not. So we're all set! Then take sterile jars (I needed 5 pieces) and layers, we shift our products tightly into the jar, put in a pot on a rag cloth and fill with boiling water. Put sterilized for 3 hours. After 3 hours, tightly close the jars, wrap each jar in newspaper and wrap in heat. In the morning put them in the cold. Bon appetit!