A domestic food processing apparatus is for rotary food processing, in which a food temperature is controlled to be in the range 50.0 to 75.0 degrees Celsius during or immediately after processing. Food such as fruit or vegetables may be processed, for example blended or juiced. The heating process is used to deactivate ascorbate oxidase so that it does not break down vitamin C after the fruit or vegetables have been blended or juiced. The temperature is high enough to provide deactivation of the ascorbate oxidase but not so high as to destroy the vitamin C by overheating. An ultrasound system (28, 30) is used to generate heat and also turbulence thus giving a combined stirring and heating effect, and the stirring effect partially destroys ascorbate oxidase activity through mechanical processes in addition to the temperature dependent effects.