Pernod is the brand name of the licorice- flavored French liqueur pastis. You will find it under either of these names, as well as Ricard. It has been used as an ingredient in aperitiefs and in cooking for over 200 years! This is a fantastically easy as well as attractive dish we really enjoy - the Pernod tempers the bitterness you sometimes have with fresh spinach. I've put in a minimal prepartion time as this will really depend on how gritty your spinach and leek are. If you've never drunk Pernod before, consider giving it a try-- I'm also posting the recipe for the drink Pernod Classique (Pastis), which is a really refreshing summer drink. Millions of Frenchman can't all be wrong . . .