Sakai, Osaka Prefecture — Japanese professional butchery tradition
The hankotsu (半骨, half-bone) is a stiff, thick-spined Japanese boning knife with a wide belly for leverage against joints and bones, distinct from the flexible Western boning knife. Used primarily in Japanese butchery for breaking down chicken, pork, and beef. The thick spine and rigid blade allow controlled force against joints; the wide belly enables scooping flesh from curved bone surfaces. Japanese butchers use hankotsu for deboning chicken (tori deba alternative), trimming tendons from yakitori cuts, and processing entire primal cuts. The Sakai tradition produces the finest hankotsu with tamahagane or VG-10 steel.
Technique tool — enables clean butchery reducing waste and preserving muscle integrity
{"Rigid blade essential — flexibility causes loss of control against bone","Thick spine distributes force when cutting through cartilage and joints","Wide belly scoops around curved bones (chicken thigh, pork shoulder)","Should be kept extremely sharp — dull hankotsu requires dangerous excessive force","Used with stabbing and pulling motions unlike Western boning knife slicing technique","Shorter blade (15-18cm) for control vs longer Western boning knives"}
{"Yakitori prep: hankotsu for separating chicken joints and trimming silver skin efficiently","Chicken deboning: insert at joint, sever ligament, rotate — entire leg in single motion","Pork belly processing: hankotsu removes ribs from skin-on belly without tearing","Professional tip: maintain separate hankotsu for fish vs meat — avoid flavor cross-contamination","The deba knife serves similar purpose for fish; hankotsu for land animals"}
{"Using flexible Western boning knife for tasks requiring rigid Japanese hankotsu","Attempting to cut through large bones — hankotsu works joints and soft bone, not hard bone","Using hankotsu for vegetable work — blade geometry is wrong","Not keeping hankotsu sharp — thick spine requires compensatory extreme sharpness"}
The Complete Guide to Japanese Knives — Sakai Cutlery documentation