A sterilized ready-meal food package comprising: a main container, defining a main volume and having a first opening at the upper part; a main food product held inside at least part of such main volume; at least one secondary container defining a secondary volume and having a second opening at the upper part; at least one secondary food product held inside at least part of the secondary volume; removable covering means arranged to occlude the first and the second opening. The main and secondary food products occupy at least 80% of the free volume available therefor; furthermore, the secondary container is associated in a removable manner inside the main container, in such a manner to occupy part of the main volume and reduce the free volume available for the main food product to a portion of the main volume. The finding also comprises a method for preparing the ready-meal food package.