Novel apparatus, thermal processing medium and method for accelerated, optimized thermal processing of product, to a user selected processing state using a thermal processing medium that is essentially neither water nor steam, does not result in any change of state during any processing step, and wherein said thermal processing medium comprises a different composition for each of the heating, holding and cooling stages but is additionally regulatory approved for direct or indirect contact with foodstuffs, is described. It further relates to the elimination of any significant additional pressurization of either the thermal processing apparatus or the medium. It also relates to eliminating expensive, anti-corrosion additives. Finally, it relates to the flexible and modular structure of the apparatus, wherein the independently controlled and optimized processing of product to any user-selected processing state can be accomplished without further modification.
