Nigel Slater's recipe for chicken and mushroom casserole, plus a mint and kefir ice

On the coldest day, with the wind howling down the chimneys, I made an old-fashioned chicken casserole, the mushroom-laden sauce deepened with sherry and pancetta.

A puree of root vegetables works well here, especially when it merges with the sherry-enriched chicken gravy. I prefer a silky puree better than a roughly forked mash for this.

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