Santoku

The santoku bōchō (三徳包丁), meaning "three virtues knife" or "three uses knife," is a Japanese general-purpose kitchen knife. Its blade, typically 13 to 20 centimeters long, has a flat edge and a sheep's-foot tip that curves down to a point at roughly a 60-degree angle. The name "santoku" can refer either to the three types of ingredients it handles—fish, meat, and vegetables—or to the three tasks it performs: chopping, dicing, and slicing. Either way, it is a multi-use tool. A related but distinct knife is the bunka bōchō (文化包丁), which features a k-tip (reverse tanto) profile instead of the sheep's-foot tip. The blade and handle of a santoku are balanced to work together, matching the blade's width and weight to the tang and handle.

The santoku was developed in Japan during the 1940s. Traditionally, Japanese kitchens used separate knives: a deba for fish, a gyuto for meat, and a nakiri for vegetables. The santoku combined the virtues of all three into one universal knife.

In design, the sheep's-foot tip brings the spine down near the cutting edge, leaving little clearance above the horizontal plane when the blade rests flat. This gives a more linear cutting edge, limiting the rocking motion compared to a Western chef's knife. While a santoku can still rock, the short cantilever and extreme tip radius mean less edge contacts the surface and less tip travel occurs. For example, dicing an onion with a Western knife involves a downward slice followed by a forward rock; a santoku relies more on a single downward cut with even contact from heel to tip.

A santoku is shorter, thinner, and lighter than a traditional European chef's knife, with harder steel (in the tradition of samurai sword steel) to compensate for the thinness. Standard blade length is 15 to 18 centimeters, versus the typical 20-centimeter European cook's knife. Most classic kitchen knives have a blade angle of 40 to 45 degrees (a bilateral 20 to 22½-degree shoulder). Japanese knives often use a kataba chisel-edge (sharpened on one side) with a more extreme 10 to 15-degree shoulder. A classic santoku, however, uses a European-style bilateral edge but maintains a sharper 12 to 15-degree shoulder, like Japanese cutlery. This requires harder steel to keep the edge from rolling, but harder, thinner steel is more prone to chipping against bone. German knives use softer steel with more material behind the edge, making them easier to sharpen, while a santoku, used properly, holds its edge longer. Santoku knives typically lack a bolster, sometimes have fluted sides (a Granton edge), and maintain uniform thickness from spine to edge.

Some santoku knives use san mai (three-layered) laminated steels, including the suminagashi pattern (墨流し, "flowing-ink"), which resembles traditional Japanese marbled paper. Higher-quality santoku knives often have forged laminated stainless steel cladding to improve strength and rust resistance while keeping a hard edge; these are generally more expensive. Many santoku copies made outside Japan differ in edge design, balance, and steel. A common trend in single-alloy copies is to add fluting or hollow recesses on the blade sides, similar to meat-carving knives, to create air pockets that reduce friction and improve slicing separation.