Japan (ankake as a category is documented from Chinese-influenced cooking in Nagasaki from the Edo period; agedashi tofu as a specific ankake application appears in 18th century Japanese cookbooks; the technique was fully integrated into Japanese cuisine by the Meiji era)
Ankake (あんかけ, literally 'poured over sauce') is Japan's primary category of thickened sauce preparations — a cornstarch or katakuriko (potato starch)-thickened liquid that is poured over a base ingredient to create a glossy, viscous coating. While covering a wide range of dishes, ankake is unified by technique: a light dashi-based sauce is thickened with a starch slurry (water and starch, typically 1:2 ratio by weight) to a consistency that coats a spoon without dripping — the nappe (French culinary term) concept applied in Japanese form. Classic applications include: agedashi tofu — silken tofu deep-fried and coated in a dashi-soy-mirin ankake; ankake chahan — fried rice coated with an egg-drop ankake sauce (Chinese-influenced); tofu ankake — cold or warm tofu floated in a pale, thick dashi sauce; chikuzen-ni ankake — simmered vegetables and chicken coated in a reduced, thickened broth; and the famous ankake udon — noodles in a thick, warming broth particularly suited to winter service. The thickening agent matters: katakuriko (potato starch) produces a cleaner, more transparent gel with better glossiness and a slightly brighter finish; cornstarch produces a more opaque, less clear result; kuzu (arrowroot) is the most refined and transparent but more expensive and harder to find.
The ankake sauce itself carries the flavour (dashi, soy, mirin base); the thickening adds no flavour but transforms mouthfeel — the sauce coats the ingredient and each bite carries a portion of the flavoured liquid; ginger or other aromatics added at the end are carried by the sauce's viscosity for maximum contact with the palate
{"Slurry ratio: mix katakuriko with cold water (never hot — it gels immediately in hot water) at 1:2 starch:water by weight before adding to the sauce","Gradual addition: add the slurry to simmering (not boiling) sauce in a thin stream, stirring constantly; add just until the desired consistency is reached — over-thickening is irreversible","Temperature for glossiness: ankake sauce should be brought to a full simmer after adding the starch for 30–60 seconds to fully activate the starch; under-cooked starch is opaque and gluey","Katakuriko vs cornstarch choice: for premium preparations (agedashi tofu, kaiseki), use katakuriko for superior clarity and gloss; cornstarch is acceptable for everyday applications","Service temperature: ankake deteriorates quickly once poured — serve immediately and in small portions; starch-thickened sauces thin as they cool and become gluey as they cool further"}
{"Agedashi tofu ankake: dashi 200ml + soy 1.5 tbsp + mirin 1 tbsp; bring to simmer; add 1 tbsp katakuriko dissolved in 2 tbsp cold water; stir until thick; pour over freshly fried tofu; garnish with grated daikon, ginger, and katsuobushi","Egg-drop addition: for a richer, more Chinese-influenced ankake (as in ankake chahan), add a beaten egg in a thin stream to the simmering, lightly thickened sauce while stirring in a circular motion — this creates silky egg ribbons throughout","Temperature maintenance during service: serve ankake dishes in warmed deep bowls; the bowl's warmth slows the sauce's cooling and extends the glossy, pourable window","Katakuriko purity test: genuine katakuriko (potato starch) is pure white and completely smooth; any yellowish tinge or grittiness indicates adulteration with cheaper starch","Ginger ankake for winter cold relief: a dashi-based ankake seasoned with soy and mirin, grated ginger stirred in at the end (not cooked — to preserve volatile ginger compounds), poured over silken tofu and rice — the traditional Japanese warming remedy"}
{"Adding starch slurry to boiling sauce: the instantaneous gelation at the point of addition creates lumps that cannot be stirred smooth; reduce to a simmer before adding slurry","Using hot water to make the slurry: cold water only — starch granules must remain ungelatinised before being distributed into the sauce","Over-thickening: an ankake sauce that doesn't pour smoothly from the ladle is too thick; it should run freely and coat the tofu or rice in a smooth sheet","Re-thickening a thinned-out sauce by reboiling: reboiling ankake sauce that has cooled and thinned does not restore it to the original texture; it becomes opaque and starchy rather than glossy","Pouring cold ankake: ankake must be served hot; even brief cooling causes the starch to set into a thick, gluey layer rather than the intended flowing coat"}
Tsuji Japanese Cooking: A Simple Art; Japanese Farm Food (Nancy Singleton Hachisu); Japanese Soul Cooking (Tadashi Ono & Harris Salat)