Potato sugar leaching - by rapid freezing

摘要

Sliced potatoes contain sugar which becomes caramelised when the potatoes are fried; this surface sugar may be removed by first freezing the potatoes in a refrigerant bath for a short period of typically 5 sec. and then immediately warming the slices to drive off excess refrigerant. This process ruptures the surface cells whose sugar is then leached out in a bath of warm water. The freezing is carried out in an insulated chamber with an internal dividing wall sepg the freezing bath and the refrigerant recovery heaters.