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A spherical water-rich load (potato) is placed on the rotating glass tray of a microwave oven some distance from the center of rotation. 1 kW of 2.45 GHz microwave power is applied via a waveguide feed. The plate rotates at 9 degrees per second. The heat transfer model involves the transition from a water-rich phase to a dehydrated phase with the corresponding changes in material properties and microwave losses. In the simulation, the rotation is performed step-wise with one step every 0.25 s and the mesh is tailored to assure mesh conformity in each angular step. The model makes use of the Phase Change Material feature that is readily available in the Heat Transfer in Solids interface. The step-wise motion that, in combination with the tailored structured mesh on the sliding mesh boundaries, assures conforming meshes, is implemented using the Events interface in COMSOL Multiphysics.