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Cod and Leek Gratin with Mustard

A comforting and hearty dish featuring tender cod fillets layered with leeks and a creamy mustard-infused sauce, topped with a crisp, cheesy crust.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 4 servings
Course: Main Course
Cuisine: French
Calories: 450
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 400 g cod fillets – boneless and skinless
  • 2 leeks, chopped – white part only
  • 200 ml cream – heavy cream for richness
  • 2 tablespoons mustard – Dijon works beautifully
  • 100 g cheese (such as Gruyère) – grated for that perfect topping
  • Salt and pepper to taste
  • Butter for greasing the dish

Method
 

Preparation
  1. Preheat your oven to 180°C (350°F).
  2. In a pan, melt a bit of butter over medium heat. Add the chopped leeks and sauté them for about 5-7 minutes or until they become soft and slightly translucent.
  3. In a separate bowl, combine the cream and mustard, whisking until well blended. Season with salt and pepper.
Assembly
  1. In a greased baking dish, place half of the sautéed leeks at the bottom. Add the cod fillets, ensuring they’re evenly spaced. Pour half of the cream mixture over the cod, then layer the remaining leeks and finish with the rest of the cream.
  2. Sprinkle the grated cheese all over the top.
Baking
  1. Place the dish in the preheated oven and bake for 25-30 minutes, or until the cheese is golden and bubbling.
  2. Once out of the oven, let it cool for a few minutes before serving.

Notes

To keep leftovers fresh, store in an airtight container in the refrigerator for up to 3 days. It can be frozen for up to a month. Reheat in a preheated oven at 180°C (350°F), and consider a quick broil at the end to revive the golden cheese crust.