* Prep time: 25 minutes
* Bake time: 25–30 minutes
* Yield: 4 servings
## Ingredients## For the Potato Au Gratin Topping:
* Russet or Maris Piper potatoes: 3 large (peeled and sliced paper-thin)
* Heavy cream: ½ cup
* Garlic: 1 clove (minced)
* Gruyère or sharp Cheddar cheese: 1 cup (shredded)
* Salt and black pepper: A pinch
* Nutmeg: A tiny pinch
For the Salmon Fish Pie Base:
- Salmon block: 1 lb (450g)
- Whole milk: 1 ¾ cups (extra ¼ cup included to account for evaporation)
- Bay leaves: 2 whole leaves
- Yellow onion: 1 medium (finely chopped)
- Butter: 3 tbsp
- All-purpose flour: 3 tbsp
- Dijon mustard: 1 tsp
- Fresh dill: 2 tbsp (chopped)
- Salt and black pepper: To taste
Step-by-Step Instructions
1. Soften the Gratin Potatoes
2. Slice the peeled potatoes paper-thin using a mandoline or a very sharp knife.
3. Bring a pot of salted water to a boil. Drop the potato slices in and parboil for 4 to 5 minutes until
slightly tender but not breaking apart.
4. Drain thoroughly, pat dry with a clean towel, and set aside.
2. Poach and Flake the Salmon
1. Place your whole salmon block into a skillet or pan.
2. Pour the 1 ¾ cups of whole milk over the fish and drop in the 2 bay leaves.
3. Bring to a very gentle simmer over medium-low heat. Let the salmon poach for 5 to 7 minutes until it turns opaque but is still slightly soft in the center.
4. Carefully lift the salmon out with a slotted spoon and place it on a plate.
5. Strain the poaching milk into a jug and save it; discard the bay leaves.
6. Use a fork to gently flake the salmon into large chunks (remove skin if present).
3. Make the Infused White Sauce
1. Melt the 3 tbsp of butter in a clean saucepan over medium heat. Add the chopped onion and cook for 3 to 4 minutes until translucent and soft.
2. Stir in the 3 tbsp of flour and cook for 1 minute, stirring constantly to form a paste (roux).
3. Gradually pour in your reserved warm, salmon-infused milk while whisking vigorously to avoid any lumps.
4. Let the sauce simmer for 2 to 3 minutes until it thickens into a velvety gravy.
5. Turn off the heat. Stir in the Dijon mustard, fresh dill, salt, and black pepper.
4. Assemble the Pie
1. Preheat your oven to 375°F (190°C) and lightly grease an 8x8 inch (or similar) baking dish.
2. Scatter your large flakes of poached salmon evenly across the bottom of the dish.
3. Pour the hot white sauce smoothly over the salmon.
4. In a small bowl, whisk together the heavy cream, minced garlic, a pinch of salt, and a tiny pinch of nutmeg.
5. Layer the parboiled potato slices tightly on top of the sauce, overlapping them like scales.
6. Pour the garlic-cream mixture evenly over the potato layers, then top generously with the shredded cheese.
5. Bake to Golden Perfection
1. Bake uncovered for 25 to 30 minutes until the gratin potatoes are tender, the edges are bubbling, and the cheese is deeply golden brown.
2. Let it rest for 5 minutes before serving so the layers can set beautifully