A food pasteurization procedure comprising the steps of: (a) introducing the foodstuff through an inlet element that continuously receives the product from a weighing unit, into a cylindrical body; (b) recording and controlling the weight of product entering per unit of time; (c) conveying the foodstuff through the cylindrical body by means of a motor-driven screw; (d) injecting saturated steam into a first injection area of the cylindrical body by means of an injection system consisting of a first set of injection points which are located opposite to each other and at a distance between them of between 100° and 140° from the radial arc which they define; (e) injecting saturated steam into a second injection area of the cylindrical body by means of a second injection system consisting of a second set of injection points which are located opposite each other and at a distance between them of between 100° and 140° from the radial arc which they define; (f) injecting saturated steam into a third injection area of the cylindrical body by means of a third injection system consisting of a third set of injection points which are located opposite each other and at a distance between them of between 100° and 140° from the radial arc which they define; (g) recording and controlling the temperature at the inlet and outlet of the cylindrical body and recording and controlling the temperature and quantity of steam injected into the injection areas and recording and controlling the speed of the conveying means, so that the temperature inside the cylindrical body over the entire distance is between 85°C and 100°C; (h) collecting the pasteurized product. (a) introducing the foodstuff through an inlet element that continuously receives the product from a weighing unit, into a cylindrical body; (b) recording and controlling the weight of product entering per unit of time; (c) conveying the foodstuff through the cylindrical body by means of a motor-driven screw; (d) injecting saturated steam into a first injection area of the cylindrical body by means of an injection system consisting of a first set of injection points which are located opposite to each other and at a distance between them of between 100° and 140° from the radial arc which they define; (e) injecting saturated steam into a second injection area of the cylindrical body by means of a second injection system consisting of a second set of injection points which are located opposite each other and at a distance between them of between 100° and 140° from the radial arc which they define; (f) injecting saturated steam into a third injection area of the cylindrical body by means of a third injection system consisting of a third set of injection points which are located opposite each other and at a distance between them of between 100° and 140° from the radial arc which they define; (g) recording and controlling the temperature at the inlet and outlet of the cylindrical body and recording and controlling the temperature and quantity of steam injected into the injection areas and recording and controlling the speed of the conveying means, so that the temperature inside the cylindrical body over the entire distance is between 85°C and 100°C; (h) collecting the pasteurized product.