Japan — ankake thickening technique likely from Chinese influence, Nara period; naturalised into Japanese cuisine Heian period; current applications in kaiseki and home cooking throughout
Ankake (あんかけ — 'poured-over sauce') is a category of Japanese thickened sauce applied to many preparations — from agedashi tofu to chilled tofu, from soft-boiled egg dishes to stir-fried vegetables. The technique involves thickening a dashi-based sauce with katakuriko (potato starch) or cornstarch to create a glossy, flowing sauce that coats ingredients and retains heat longer than a thin broth. Ankake appears across Japanese cuisine: in itamemono (stir-fried dishes), in nimono where the final sauce is thickened, as a sauce for steamed egg custard (chawanmushi ankake), and in Chinese-influenced Japanese dishes where the thick, glossy texture is a characteristic feature. The ratio for a standard ankake: dashi 200ml, light soy sauce 1 tablespoon, mirin 1 tablespoon, sake 1 tablespoon, katakuriko 2 teaspoons mixed with 2 teaspoons cold water (always cold — to prevent premature gelatinisation). The starch mixture is added to the simmering sauce in a slow, continuous pour while stirring constantly — a sudden dump creates lumps. The sauce thickens almost immediately at simmering temperature; it must not be overcooked or the starch breaks down and the sauce thins again. Ankake is used in cold-weather preparations to keep food warm longer at the table.
The sauce itself takes its flavour from the dashi base — ankake provides texture (glossy, flowing, heat-retaining) and visual appeal (glossy coat) rather than a distinct flavour of its own
{"Cold water starch slurry: always dissolve starch in cold water before adding — hot liquid causes immediate gelatinisation and lumping","Pour in a thin stream while stirring: prevents clumping; add to simmering liquid, never boiling vigorously","Correct consistency: ankake should flow and coat a spoon — not thick like gravy; too thin means insufficient starch, too thick means excess","Do not boil vigorously after adding starch: gentle simmer for 30–60 seconds achieves maximum thickening; violent boiling breaks down starch chains and thins the sauce","Katakuriko vs cornstarch: katakuriko (potato starch) produces a more delicate, translucent gel with softer texture; cornstarch is slightly more stable and opaque","Serve immediately: ankake continues to thicken as it cools; sauce that is correct consistency hot will over-thicken as it rests"}
{"For egg-drop finish in ankake: after thickening, turn heat to minimum, pour beaten egg in a thin spiral stream, and let sit 10 seconds before a single gentle stir — creates beautiful egg ribbons","Ginger ankake for chawanmushi: add finely grated ginger to the sauce before thickening — the heat activates the ginger's enzymes for a warming finish","Ankake texture test: dip a spoon and run a finger through the coating — if the line holds for 5 seconds, the consistency is correct","Reheating ankake: add a small amount of fresh dashi and warm gently — the starch often breaks down on cooling and needs a small addition to restore consistency"}
{"Adding hot water to the starch before mixing — this creates lumps; always mix starch with cold water","Stopping stirring when adding starch — constant motion is essential; any pause creates lumps","Boiling the sauce vigorously after thickening — starch chains break down; vigorous boiling produces a thin, starchy-tasting sauce"}
Shizuo Tsuji, Japanese Cooking: A Simple Art; Hiroko Shimbo, The Japanese Kitchen