Pour 2-2.5 liters of cold water into a pot. Boil it. Put the cabbage into the boiling water. Bring it to a boil.
Peel the potatoes, wash them, and cut them into small dice. Place the potatoes into the pot. Cook for 15 minutes.
Chop the onion.
Cut the carrot into strips or thin half-rings.
Dice the pickled cucumbers.
Heat a frying pan, pour the vegetable oil in. Place the carrots and onions in the hot oil. Stew them until soft, stirring occasionally, over medium heat for 2-3 minutes.
Put the cucumbers, sauteed vegetables, canned corn, and salt into the pot. Cook the rassolnik with corn for another 10 minutes slowly under the lid.