Sort pearl barley, rinse and soak in cold water overnight.
Pour water into the multicooker bowl, bring to a boil, add cereals, set the Multicooker mode to 105 degrees for 40 minutes.
When the porridge is almost ready, and there is almost no liquid left, switch to Multicook 95 degrees for another 20-30 minutes and add salt.
In the meantime, peel the onion, chop and sauté in vegetable oil until golden brown.
Transfer the onion frying to the prepared barley porridge, mix. Serve immediately.