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Finely chop the onion and fry in a saucepan until golden.
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Crush the peppercorns coarsely (best to do this in a pestle and mortar) and add to the saucepan then add Worcester sauce and fry for a further 30 seconds
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Add in the cream and stock and stir well, bring to boil and allow the to reduce down by about half. If needed, add the cornflour mixed with a little cold water to thicken the sauce. Serve while hot.

