Heat a little fat or oil in a frying pan, add the Kidneys and brown for 2 minutes turning occasionally.  Add the sherry and allow it to bubble before adding the white wine vinegar, to this add the redcurrant jelly stirring to melt and then the Worcestershire sauce and plenty of black pepper.

Season with a pinch of salt, add the double cream for richness and simmer until the sauce is reduced and appears glossy.  Check the seasoning, more pepper may be required, and serve.