Substitutions: What Works and What Does Not (代用の可否)

Honest swaps with their limits - because a substitution that works in a stew can fail in a dipping sauce.

Tamari for koikuchi	Works in cooking; slightly richer and less aromatic. In raw dipping, use a little less and taste
White miso for red (and back)	Works with amount changes: white needs more for the same salt, red needs less and darkens the dish - colour is the real difference
Usukuchi for koikuchi	Only where colour matters, and use less - usukuchi is saltier, not weaker
Chinese or Korean soy sauce for shoyu	Different balance (often sweeter or stronger). Fine in hearty cooking; not a swap in delicate Japanese dishes
Distilled vinegar for rice vinegar	Too sharp at equal amounts. Rice vinegar is the reference for sushi rice; if swapping, reduce and sweeten - and expect a different result

Every substitution trades something. This table's rule is to name the trade: colour, salt, aroma or sweetness - never to promise 'the same taste'. Where a dish is defined by the original (saikyo-yaki without Saikyo miso, sashimi under a cooking sauce), the honest answer recorded here is that there is no full substitute, only an approximation for home cooking.

Substitutions: What Works and What Does Not (代用の可否)

See also