Goose fat is in short supply this Christmas, after bird flu wiped out a third of the European population of geese.

Goose fat sales doubled last year following Nigella Lawson?s insistence that it was the vital ingredient for perfect roast potatoes.

Duck fat may be a viable substitute (and is also recommended by Ms Lawson), and may be the only option as shops are unable to find supplies of goose fat in time for Christmas following the bird flu outbreak in Europe.

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