His follow-up Medium Raw, due out Tuesday, chronicles how celebrity, constant travel, divorce, remarriage and a baby daughter have changed him and his take on food culture a decade after Kitchen Confidential's debut.

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So if kept very clean and very cold and handled with care, fresh tuna can be enjoyed medium rare, rare or even raw.

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Small and medium-sized businesses face high raw-materials prices and rising labour costs, but miss out on the low electricity prices and tax advantages enjoyed by big firms.

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