-
Heat a splash of oil in heavy bottom pot over high heat
-
When oil is nearly smoking hot, add langoustine shells, stir vigorously and reduce heat to medium.
-
After a few minutes, when shells are thoroughly heated through and heat has reduced, add shallots, carrot, leak, celery and garlic, and fry for a minute or two.
-
Add fish stock, white wine and a splash of water. Bring pot to a simmer and simmer for roughly thirty minutes, skimming any foam that rises to the top.
-
After thirty minutes, strain sauce base into a suitable container, add saffron and set aside.
-
Wash and wipe out the pot, return to heat, add two tablespoons of butter and let melt.
-
When butter is melted, add two tablespoons of flour and fry for a couple of minutes, stirring frequently. What you have here is a roux and it will thicken any liquid added to it.
-
Grab your container of sauce base and stir a few tablespoons into the roux. It will hiss and splatter and turn to a paste-like consistency, keep stirring.
-
Keep slowly whisking and adding liquid to the roux until you have a smooth, thickened sauce. The sauce will continue to thicken until it comes to a simmer at which point it will be at its thickest.
-
When sauce simmers, stir in 150 milliliters of heavy cream and ten grams of finely chopped truffle.
-
Simmer for a minute or so and slowly stir in cheese, mix till cheese is melted and thoroughly integrated.
-
Taste and season with salt and pepper. Keep warm on a back burner over low heat.