Cod With Mustard Sauce Recipe: Flaky Fillets in Creamy Dijon Glaze

This recipe delivers flaky cod fillets bathed in a rich, creamy mustard sauce that’s surprisingly simple to perfect. The key is gentle cooking to preserve the fish’s delicate texture.

I’ve refined this method to ensure the sauce clings beautifully to each bite, enhancing the cod’s natural sweetness without overpowering it. Ready in under 30 minutes, it’s an elegant meal with minimal effort.

Ingredients for Cod with Mustard Sauce

Gather these quality ingredients for flaky cod in creamy Dijon mustard sauce, ready in minutes.

The cod is non-negotiable here. Wild-caught Pacific cod from Whole Foods or Trader Joe’s has the best texture and flavor. Look for fillets that are translucent and smell like the ocean, not fishy. The Dijon mustard should be smooth and potent—Maille or Grey Poupon are reliable brands. Avoid anything labeled ‘prepared yellow mustard’ as it lacks the depth this sauce needs.

No white wine? Substitute with chicken stock plus a splash of lemon juice. Shallots can be replaced with fine minced yellow onion, though the flavor will be slightly more pungent. For a lighter sauce, swap heavy cream for half-and-half, but the texture won’t be as luxurious. The parsley garnish is optional but adds a fresh pop of color (and flavor).

The sauce keeps 2-3 days in the fridge—reheat gently to avoid curdling. Cod is best the day it’s cooked, but leftovers hold 24 hours max. Store fresh parsley wrapped in damp paper towels in a bag for up to 5 days.

Step-by-Step Instructions for Cod With Mustard Sauce

Master this technique for perfectly flaky cod with a rich, velvety mustard glaze.

Step 1: Sear the Cod Fillets to Golden Perfection

Pat the 1.5 lb cod fillets completely dry with paper towels—this is essential for achieving a proper sear. Season both sides evenly with 1 tsp kosher salt and ½ tsp freshly ground black pepper.

Heat the 1 tbsp olive oil in a large skillet over medium-high heat until it shimmers. Add the cod and cook undisturbed for 3-4 minutes per side until golden brown and the fish releases easily from the pan. The fillets should be opaque and flake slightly when tested with a fork. Transfer to a plate and tent with foil to keep warm.

Step 2: Build the Aromatic Base for the Sauce

Reduce heat to medium and add 1 tbsp unsalted butter to the same skillet. Once melted, add the 2 finely minced shallots and sauté for 2-3 minutes until translucent and fragrant. Avoid browning them—they should soften gently to build a subtle, sweet foundation for the sauce.

Sprinkle the 2 tbsp all-purpose flour over the shallots and stir constantly for 1 minute to cook off the raw flour taste. This creates a light roux that will thicken the sauce beautifully without making it heavy.

Step 3: Deglaze and Develop the Creamy Mustard Sauce

Pour in the ½ cup dry white wine and ¼ cup chicken stock, scraping up any browned bits from the bottom of the pan with a wooden spoon. Let the mixture simmer for 2-3 minutes until reduced by about half. This step captures all the caramelized flavors from searing the cod.

Reduce heat to low and whisk in the 1 cup heavy cream, 3 tbsp Dijon mustard, and 2 tbsp fresh lemon juice. Stir in the remaining 1 tbsp unsalted butter until melted. Simmer for 3-4 minutes until the sauce thickens enough to coat the back of a spoon. Taste and adjust seasoning if needed—the mustard should be pronounced but balanced by the cream.

Step 4: Finish and Serve with Fresh Herb Garnish

Return the cod fillets to the skillet and spoon the sauce over them. Let everything warm through together for 1-2 minutes on low heat. The sauce should cling to the fish and pool slightly around it.

Transfer the cod to serving plates and drizzle with the remaining mustard sauce. Garnish with the ¼ cup chopped fresh parsley for a bright, fresh contrast to the rich sauce. The cod should be flaky and tender, with the creamy mustard glaze adding depth and a slight tang that complements the fish perfectly. Serve immediately while hot.

Dietary Considerations for This cod with mustard sauce

Gluten-Free Adaptation

To make this dish gluten-free, swap the 2 tbsp all-purpose flour for cornstarch or a gluten-free flour blend like King Arthur Measure for Measure. Mix 1 tbsp cornstarch with 1 tbsp cold water to create a slurry, then stir it into the sauce during the last 2 minutes of cooking. 💡

Dairy-Free Modification

Replace the 1 cup heavy cream with full-fat coconut milk or unsweetened almond milk combined with 1 tbsp coconut cream for richness. Use olive oil instead of butter—I recommend California Olive Ranch for a clean flavor that won’t overpower the mustard.

Low-Carb Version

For a keto-friendly approach, omit the flour entirely and thicken the sauce by simmering it longer until reduced by half. The Dijon mustard and heavy cream are already low-carb, and cod is a perfect protein choice. This keeps the dish under 5g net carbs per serving.

Pescatarian Considerations

This recipe is naturally pescatarian, but ensure your chicken stock is fish-free. I prefer Imagine Foods Vegetable Broth as a substitute—it adds a subtle depth without competing with the cod. Also, verify the Dijon mustard contains no anchovies or other fish products. 🌱

Allergy Alerts

Cod is a common allergen, so check with guests first. The sauce contains mustard, which can trigger reactions in sensitive individuals. For a mustard-free version, use 2 tbsp white miso paste mixed with 1 tbsp lemon juice as a tangy alternative.

Sodium Control

To reduce sodium, use low-sodium chicken stock and unsalted butter, and cut the added salt in half. Rely on the Dijon mustard and lemon juice for flavor. I find this reduces the sodium content by about 40% without sacrificing taste.

Frequently Asked Questions