【Reading】やきしも

【English Name】Yakishimo (skin searing)

Applying the flame of straw or a torch to the skin side of a fish to instantly sear it with color, then immediately chilling it rapidly in ice water—this is the technique known as yaki-shimo (seared skin). Its aim is to draw the fat and umami stored at the boundary between skin and flesh up to the surface while rendering the skin itself into a soft texture.

In sushi practice, it is widely used for skin-on toppings such as sea bream (tai), striped jack (shima-aji), splendid alfonsino (kinmedai), and bonito (katsuo). By deliberately leaving the skin on and searing it, a fragrant aroma is produced, adding depth to the flavor.

A similar technique is "yu-shimo" (hot-water blanching of the skin). Whereas yu-shimo cooks the skin by pouring boiling water over it, yaki-shimo is fundamentally different in that it heats with a direct flame. The charred aroma unique to direct flame is the hallmark of yaki-shimo, while yu-shimo tends to render the skin softer.

The searing takes only a few seconds; if overheated, the heat reaches the interior of the flesh, so the artisan must exercise delicate judgment. Immediately after searing, it is crucial to chill it at once in ice water to maintain a state in which only the exterior is cooked.

This technique is used in a wide range of settings—not only nigiri sushi, but also sashimi plated in the tataki style and single dishes paired with ponzu and condiments.