Kombu has been harvested from the cold waters around Hokkaido since antiquity. The island's cold, nutrient-rich Pacific waters produce kombu with exceptional glutamate concentration. Three primary production regions produce distinct grades: Rishiri (Rishiri Island, northern Hokkaido) — the most delicate, pale dashi; Rausu (eastern Hokkaido) — fuller, more robust flavour; Ma-kombu (southern Hokkaido coast) — the most widely available, excellent all-purpose grade. [VERIFY] Tsuji's specific kombu grade recommendations. · Preparation
This is the professional-depth technique entry for Kombu: Selection and Use, including full quality hierarchy, species precision, and cross-cuisine parallels.
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