When aqueous suspension of granular starches are heated above the gelatinisation temperature, the gelatinisation temperature, the granules, become highly hydrated and swell to many time their original volumes. Continued heating, particularly in the presence of shear, produces cooked pastes which are mixtures of swollen granules. Granule fragments, and molecularly dispersed starch molecules leached from the granules. Granule swelling and disintegration during the cooking process are accompanied by significant changes in viscosity and other rheological properties of the paste. These are important because they indicate utility