What is the undisputed king ingredient of Tosa cuisine from Kochi Prefecture?
*Katsuo* (skipjack tuna)
The undisputed king of Tosa cuisine, originating from the region that is now Kochi Prefecture, is *katsuo*, which is skipjack tuna. This fish is central to the culinary identity of this coastal Japanese area, reflecting the deep reliance on the Pacific Ocean's bounty. The utilization of *katsuo* permeates Tosa cooking in numerous forms, ranging from fresh preparations to highly processed ingredients. The local culture places immense value on this resource, developing specialized methods for harvesting, processing, and preparing it to ensure maximum flavor extraction and resourcefulness, highlighting its iconic status within the region's gastronomy.

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