Victorinox Rosewood Forged Collection 6.75 Inch Hollow Edge Santoku Knife  A hollow edge blade is a knife blade with a series of evenly spaced vertical indentations close to the cutting edge. These indentations prevent cut items from sticking to the blade bec ause of the air pockets the indententions creates when slicing. Santoku is a general-purpose kitchen knife originating in Japan. The word refers to the three cutting tasks which the knife performs well: slicing, dicing, and mincing.