Sterilize the jars. Put them in the oven for 20 minutes, the temperature inside should be 100-110 °C. Then turn off the oven, let the jars cool inside for a few minutes.
Cut the cucumber into cubes.
Finely chop the onion. Grate the carrots on a coarse grater.
Pour boiling water over the pearl barley for 20 minutes.
Cook the cereal over low heat until half cooked for 20 minutes.
In a saucepan, mix chopped vegetables, pearl barley, tomato paste. Add sugar and salt.
Place on the stove. Pour in water and simmer for 15 minutes.
Add vegetable oil and simmer for another 5 minutes. A couple of minutes before the end, add vinegar.
Place the boiling rassolnik into a jar and screw it on.