Boil the vegetables. Put the carrots and beets to boil, adding 1 teaspoon of salt to the water. Check the readiness with a knife. The average cooking time is about 40 minutes.
Boil the lentils. Pour 250 ml of cold water over the lentils and set to boil. After boiling, add a pinch of salt and reduce the heat to medium. Cook the lentils for 15 minutes after boiling. Drain the water, let the lentils cool and transfer to a salad bowl.

Prepare the salad. Finely dice the onion, pickles, beets and carrots. Place all ingredients in a salad bowl with the lentils. Add canned peas, pour in vegetable oil and mix gently.