It is provided a processing system for processing a liquid or semi-liquid food product. The food product is a composition of a first sub-composition having a low concentration of particles and a second sub-composition having a high concentration of particles. The high concentration is greater than said low concentration. The processing system comprises a first mixing tank for mixing said first sub-composition, a second mixing tank for mixing said second sub-composition, and a heat treatment apparatus arranged to receive said first sub-composition and said second sub-composition and to heat treat said first sub-composition and said second sub-composition.
