Fish Pie With a Sourdough Crust

Preparation

1. Step 1

   Heat the oven to 400 degrees Fahrenheit/200 degrees Celsius.

2. Step 2

   In a large sauté pan or skillet, heat 2 tablespoons butter over medium-high. Add the bacon and cook, stirring occasionally, until it starts to take on color, about 5 minutes. Add the leeks and cook, stirring occasionally, until beginning to soften, about 4 minutes. Add the garlic and cook, stirring frequently, until fragrant, about 30 seconds. Stir in the flour and mustard powder, then add the milk, stock, ¾ teaspoon salt and a good grind of pepper, stirring to get rid of any lumps. Bring to a simmer, then lower the heat to medium and cook until thickened, about 5 minutes. Remove from the heat, stir in the tarragon, parsley and dill, then set aside to cool slightly, about 15 minutes.

3. Step 3

   Add the salmon, halibut and shrimp to a 9-by-13-inch/23-by-33-centimeter baking dish. Sprinkle all over with ½ teaspoon salt and plenty of pepper, then top with the lemon zest and juice. Pour the sauce on top, stirring gently to combine.

4. Step 4

   In a large bowl, toss the bread with the remaining 3 tablespoons melted butter until well coated. Transfer to the baking dish, gently pressing to submerge the bread cubes halfway into the base. Bake until golden and bubbling, 25 to 28 minutes. Set aside to cool for about 15 minutes.

5. Step 5

   While the pie is in the oven, combine the reserved chopped herbs and oil in a small bowl. Drizzle this all over the pie right before serving.