Sauce Nantua

🧂 Ingredients

• 200 g Crayfish shells(Ensure shells are thoroughly cleaned and dried. If using pre-cooked crayfish, reserve the shells from the tails.)
• 150 g Unsalted butter(Divided. Use high-quality butter for best flavor.)
• 300 ml Heavy cream(35% fat content or higher for richness.)
• 200 ml Fish stock(A good quality homemade or store-bought fish stock is recommended.)
• 2 tbsp Cognac(A good quality brandy can be substituted if cognac is unavailable.)
• 1 tbsp Tomato paste(Adds depth of color and a subtle umami note.)
• to taste Salt
• to taste White pepper

👨‍🍳 Instructions

1. 1

   Prepare the crayfish butter: In a food processor, combine the cleaned crayfish shells with 75g of the unsalted butter. Process until a coarse paste forms. Transfer this paste to a small saucepan. Cook over medium-low heat, stirring frequently, for about 15-20 minutes. The butter will melt and the shell fragments will release their flavor and color into the butter. Be careful not to burn the butter. Strain the mixture through a fine-mesh sieve, pressing down on the solids with the back of a spoon to extract as much flavored butter as possible. Discard the solids. You should have a vibrant orange-red butter. Set aside.

   ⏱️ 20 minutes
2. 2

   Deglaze and reduce: In a separate saucepan, heat the fish stock and cognac over medium heat. Bring to a simmer and let it reduce by about half, which should take approximately 5-7 minutes. This concentrates the flavors.

   ⏱️ 7 minutes
3. 3

   Build the sauce base: Add the tomato paste to the reduced fish stock and cognac mixture. Stir well to combine and cook for 1 minute, allowing the tomato paste to deepen in color and flavor. Pour in the heavy cream and bring the mixture to a gentle simmer. Continue to simmer, stirring occasionally, until the sauce has thickened enough to coat the back of a spoon. This may take about 10-15 minutes.

   ⏱️ 15 minutes
4. 4

   Emulsify and finish: Remove the sauce from the heat. Gradually whisk in the remaining 75g of unsalted butter, one tablespoon at a time, until fully incorporated and the sauce is smooth and glossy. Then, whisk in the prepared crayfish butter until the sauce is a uniform pale orange color and well emulsified. Taste and season generously with salt and white pepper. If the sauce is too thick, you can thin it with a little more warm fish stock or cream. Serve immediately.

   ⏱️ 8 minutes

💡 Pro Tips

• ✓For the smoothest sauce, ensure you strain the crayfish butter very thoroughly. A cheesecloth-lined sieve can be helpful.
• ✓The quality of your crayfish shells and fish stock will significantly impact the final flavor of the sauce.
• ✓Sauce Nantua is best served fresh. Reheating can sometimes cause it to break.
• ✓The color of the sauce will depend on the intensity of the crayfish shells used.

🔄 Variations

• Shrimp Butter: Substitute shrimp shells for crayfish shells for a similar, though less intensely flavored, sauce.
• Lobster Nantua: Use lobster shells and butter for an even richer and more luxurious version.
• Add a pinch of cayenne pepper for a subtle kick.

🥗 Nutrition

Per serving