the invention relates to a method of , and a device for delivering a predetermined volume of beverage into a thermoplastic container formed from a heated preform , the preform being positioned in a mould , characterized in that the method includes a step of injecting at least some beverage into a recess in the preform so as to promote expansion of the preform inside the mould , the mould defining the shape of the container , a longitudinal displacement of a stretch rod carried out during a given period ensuring longitudinal elongation of the heated preform , the stretch rod being immobile at the end of the given period , and a volume of beverage greater than a predefined fraction of the predetermined volume , preferably equal to 50 %, being present in the recess at said end of the given period .