A method of sterilizing a food composition formed from a heterogeneous mixture of at least one liquid phase and solid particles including a step of preparing a concentrated liquid/particles phase with a reduced amount of salt, a sterilization step including a phase of ohmic heating and a phase of holding the concentrated phase, a step of cooling the sterile concentrated phase, and a packaging step, wherein the concentrated phase is mixed after the heating phase with an aqueous phase including sterile salted water for formulation of the heterogeneous mixture of at least one liquid phase and solid particles.