Optimal heating of solid foods using the conventional technologies can be challenging due to the fact that heat transfer is limited by internal conduction. Heating of shrimps can be problematic due to the size variation within a batch of shrimps. The size variation within a batch induces over-processing of especially the smallest shrimps in the batch. This means that in order to process according to safety criteria and to meet product specification there is a certain risk for deteriorated product quality and yield loss.