Chop the vegetables. Finely chop the onion. Peel the pre-boiled carrots and potatoes and grate on a coarse grater.
Prepare the onion. Fry the onion in a frying pan with vegetable oil until translucent, 3-4 minutes, stirring.
Prepare the beefsteak. Place the onion, carrot and potato in a deep bowl, add salt, pepper and mix. Form 3 flat cakes from the mixture, put 1 teaspoon of corn in the middle of each. Shape the flat cake into a beefsteak. Place flour on a saucer and roll the cutlets in flour. Fry the flat cakes on both sides over medium heat with vegetable oil for 3-4 minutes until golden brown.