Japan-wide — potato starch production from Hokkaido
Katakuriko (片栗粉, 'potato starch') is the Japanese kitchen's primary thickening and coating starch — used for ankake sauce thickening, karaage (Japanese fried chicken) coating, agemono dusting, and as a binding agent in various preparations. Despite the historical name (katakuri refers to the dogtooth violet plant whose starch was the original source), modern katakuriko is made from potato starch — transparent, neutral in flavour, with exceptional thickening power and the ability to produce a more translucent, glossy gel than cornstarch. Key applications: ankake sauce thickening (produces cleaner, more translucent sauce than cornstarch); karaage coating (potato starch alone or mixed with flour creates a crispier, more delicate crust than all-flour coatings); gyoza wrappers (small amounts improve texture); and mochi-type confectionery where it is used as an anti-sticking powder on surfaces.
Flavourless as an ingredient; creates translucent, glossy coatings and sauces that allow the flavour of other ingredients to show through unmasked — the starch is purely textural and visual in function
Make katakuriko slurry just before use (potato starch settles very rapidly — the slurry must be mixed fresh or re-stirred immediately before adding to hot liquid); gelatinises at approximately 65°C — lower than cornstarch; produces a softer, more translucent gel than cornstarch; for karaage, use a higher ratio of katakuriko than flour for maximum crispness and a more golden-white colour; dissolve in equal parts cold water before adding to any hot preparation.
The karaage flour blend: 70% katakuriko + 30% flour produces the optimal crust — the potato starch creates the white, ultra-crisp exterior while the flour provides adhesion and structure; pure katakuriko karaage (no flour) creates a delicate, extra-crisp, almost translucent shell; for crystal clear ankake sauce: use potato starch, not cornstarch — the transparency is visually significant for premium preparations; arrowroot starch (kudzu/kuzu) produces a similar but subtler result to katakuriko in thickening applications and is used in traditional Japanese confectionery.
Allowing the katakuriko slurry to settle before use (the starch falls to the bottom and adding settled slurry creates lumps in the sauce); using katakuriko as a direct substitute for cornstarch in Western recipes without adjusting (different thickening strength — use slightly less katakuriko than cornstarch); over-thickening with too much katakuriko (creates an unpleasantly gelatinous sauce — the goal is just to coat, not to set).
Japanese Cooking: A Simple Art — Shizuo Tsuji