150ml                yellow mustard (French's)
   175ml                red wine vinegar
   50g                  sugar
   1 1/2  tablespoons   butter
   2      teaspoons     salt
     1/2  teaspoon      Worcestershire sauce
   1 1/4  teaspoons     ground black pepper
     1/2  teaspoon      Tabasco sauce

In a medium saucepan, combine ingredients, stirring to blend. Over low heat, simmer 30 minutes. Let stand at room temperature 1 hour before using.