/ck/ - Food & Cooking

>>8780089
Maguro bōchō (鮪包丁, lit. "tuna knife") or Maguro kiri bōchō (鮪切り包丁, lit. "tuna cutter")

That there's showboating, normally they are two men working the knife, other guy has the fun job of holding the blade with a wrapped towel and steering the the knife around bones by bending the blade.