Wash the potatoes, beets, and carrots, put in a saucepan, add cold water, put on fire, bring to a boil. Cook over low heat until tender: carrots and potatoes for 20-25 minutes, and beets for about an hour. Take out the finished vegetables, cool.
Peel the potatoes, cut into cubes.
Peel the carrots, cut them into cubes.
Peel the beets, grate on a coarse grater.
Open a can of corn, drain the liquid.
Wash and chop the green onion.
Marinated zucchini (or cucumbers) cut into cubes.
Open a can of canned fish. Remove fish from oil, break (cut) into pieces.
Put all the ingredients in a salad bowl, add salt. Season with oil from a can of fish.
Stir the salad. The vinaigrette with fish is ready.