code: def unregister(self, recipe):
          
          if recipe not in self.recipes.keys():
              self.__log.warning("Can not unregister recipe %s" % recipe)
          else:
              del (self.recipes[recipe])
              self.__log.debug("Recipe %s got unregistered" % recipe)
docs: Unregisters an existing recipe, so that this recipe is no longer available.
  
          This function is mainly used during plugin deactivation.
  
          :param recipe: Name of the recipe