Ohitashi (Blanched Greens in Dashi)

Ohitashi belongs to the category of Japanese vegetable preparations designed to express a vegetable's character with minimal intervention. The word means literally "to steep" or "to soak" — the greens steep briefly in the seasoned dashi rather than being tossed in a conventional dressing. It appears in kaiseki as a palate-clearing small course and in everyday cooking as the most common vegetable side dish.

Leafy greens — spinach, chrysanthemum greens (shungiku), komatsuna — blanched in heavily salted boiling water, immediately shocked in cold water to preserve colour, squeezed firmly, and dressed in a small amount of dashi seasoned with soy and mirin. The preparation is deceptively simple and technically precise: the blanch time is measured in seconds, the cold shock is immediate, the squeeze is decisive, and the final dressing is restrained enough to enhance rather than mask the green's natural flavour.

Ohitashi is — Oxidation Arrest. The heavily salted boiling water and immediate cold shock are both mechanisms to prevent oxidative degradation of chlorophyll — the green colour and fresh flavour are preserved by chemistry, not by luck. As Segnit notes, dashi and green vegetables is among the most naturally reinforcing combinations in Japanese cooking: the dashi's glutamates amplify the perception of the vegetable's natural bitterness (from chlorophyll breakdown products) and sweetness simultaneously.