Abstract: A post-packaging ultra-pasteurization process for VSP packages, particularly suitable for extended shelf-life chilled ready meals, which process comprises setting the pressure of the retort vessel where the ultra-pasteurization of the VSP package is carried out, at a value comprised between 2 and 5 bar, prior to the initiation of the heating cycle, keeping the pressure within the above range during the whole heating cycle, carried out at a temperature and for a time sufficient to provide for a 6 log reduction in the count of cold growing non-proteolytic Clostridium botulinum spores, and for most of the cooling cycle until the packaged product almost reaches room temperature. By carrying out the ultra-pasteurization of a VSP package according to the above method or protocol, it is possible to reach high temperatures, e.g., in the range 90-99° C. but even higher, e.g. up to 108-110° C., without getting any sauce splitting and also controlling the loss of moisture from the protein components of the food product.