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Why Acidity Changes the Recommended Time
Acid (lemon juice, vinegar) chemically denatures protein β essentially "cooking" it without heat. In short bursts this tenderizes, but over time it can make the surface mushy or paradoxically tougher. Seafood is especially thin and delicate, so a strong-acid marinade left more than 15-30 minutes can turn the surface ceviche-like, while a mild marinade (yogurt, soy sauce) can safely sit on chicken thighs for up to 24 hours.