Fresh horseradish is difficult to source. Try a good farmers' market or specialist supplier, or look online. Keep fresh horseradish in a paper bag in the fridge for up to one week, or cut it into ...
Bring to the boil, stirring until thickened, then add the Worcestershire sauce and sugar and season ... Mix the mustard, horseradish and double cream (if using) in a bowl until well combined.