The invention relates to an apparatus for cooling high-heat-treated food products with a flash-cooler, having a container for a pre-product to be cooled with an inlet for the pre-product to be cooled and an outlet for the cooled end product of the food product as well as cooling equipment, the cooling equipment having a cooling jacket associated to the container, through which at least one part of the wall of the container is cooled. The invention also relates to a heat-treatment line for food products, having one such apparatus. The invention also relates to a method for cooling high-heat-treated, particularly ultra-high-heat-treated food products, using a flash cooler having a container for a pre-product to be cooled, with an inlet for the pre-product to be cooled and an outlet for the cooled end product of the food product and cooling equipment.