Which element provides the sour component in the flavor profile of *Katsuo no Tataki*?
Answer
*Ponzu* sauce
The preparation of *Katsuo no Tataki* is celebrated for achieving a complex balance across all five basic tastes. The sour dimension of this flavor profile is specifically attributed to the inclusion of *ponzu* sauce, a citrus-based dressing often utilized to complement the rich, lightly seared fish. This sourness cuts through the richness and balances the sweetness (from enhanced amino acids), bitterness (from the char), saltiness (from seasoning), and the pervasive umami flavor inherent to the high-quality bonito used in the dish.

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