Koska jams are cooked using the best quality fruits in a vacuum and closed system without increasing it above 80 degrees, and packaged without using any preservatives. HMF (Hydroxymethyl furfural) rate does not increase, as it is cooked with a special cooking technique without increasing it above 80 degrees. HMF has been scientifically proven to have adverse health effects. Koska jams are produced using advanced technology, so the HMF rate does not increase, it contains much more vitamins and minerals than jams cooked in open pots and cauldrons.