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Place the peeled and chunked russet potatoes in a large pot. Cover with cold water by 1 inch and add a generous pinch of salt. Bring to a boil over high heat, then reduce heat to medium and simmer until fork-tender, about 15-20 minutes. Drain well.

While potatoes cook, prepare the fish and vegetables. Cut salmon and white fish into 1-inch pieces. Finely dice the red onion, slice the leek into thin rounds, and dice the fennel bulb. Finely chop the fresh dill and parsley. Zest the lemon.

Preheat your oven to 375°F. In a large skillet or Dutch oven, melt the algae cooking oil and 2 tablespoons of salted butter over medium heat. Add the diced red onion and sauté until softened, about 3-4 minutes.

Add the sliced leeks and diced fennel to the skillet. Cook, stirring occasionally, until tender, about 5-7 minutes. Season lightly with salt.

Sprinkle the all-purpose flour over the cooked vegetables and stir constantly for 1 minute to create a roux. Gradually whisk in the whole milk, a little at a time, until the sauce is smooth and thickened. Season with 1/2 teaspoon salt and 1/4 teaspoon white pepper.

Gently fold the fish pieces, chopped dill, chopped parsley, and lemon zest into the cream sauce. Cook for just 2-3 minutes, or until the fish is just opaque and cooked through. Be careful not to overcook the fish.

Pass the drained hot potatoes through a potato ricer into a large bowl. Add the 4 tablespoons of cubed salted butter, 3 egg yolks, 1/2 teaspoon salt, and 1/4 teaspoon white pepper. Mix thoroughly until the potatoes are smooth and creamy.

Spoon the fish and vegetable filling evenly into an oval-shaped baking dish (approximately 9x13 inches). Transfer the mashed potatoes to a piping bag fitted with a large star tip (or use a spoon/spatula). Pipe or spread the mashed potatoes evenly over the fish filling, covering it completely.

Use a palette knife or the back of a spoon to create a decorative pattern on the surface of the mashed potatoes, such as scallops or scales. Place the baking dish on a baking sheet to catch any potential drips.

Bake in the preheated oven for 30-35 minutes, or until the mashed potato topping is beautifully golden brown and the filling is bubbling around the edges. Let rest for a few minutes before serving.


Place the peeled and chunked russet potatoes in a large pot. Cover with cold water by 1 inch and add a generous pinch of salt. Bring to a boil over high heat, then reduce heat to medium and simmer until fork-tender, about 15-20 minutes. Drain well.

While potatoes cook, prepare the fish and vegetables. Cut salmon and white fish into 1-inch pieces. Finely dice the red onion, slice the leek into thin rounds, and dice the fennel bulb. Finely chop the fresh dill and parsley. Zest the lemon.

Preheat your oven to 375°F. In a large skillet or Dutch oven, melt the algae cooking oil and 2 tablespoons of salted butter over medium heat. Add the diced red onion and sauté until softened, about 3-4 minutes.

Add the sliced leeks and diced fennel to the skillet. Cook, stirring occasionally, until tender, about 5-7 minutes. Season lightly with salt.

Sprinkle the all-purpose flour over the cooked vegetables and stir constantly for 1 minute to create a roux. Gradually whisk in the whole milk, a little at a time, until the sauce is smooth and thickened. Season with 1/2 teaspoon salt and 1/4 teaspoon white pepper.

Gently fold the fish pieces, chopped dill, chopped parsley, and lemon zest into the cream sauce. Cook for just 2-3 minutes, or until the fish is just opaque and cooked through. Be careful not to overcook the fish.

Pass the drained hot potatoes through a potato ricer into a large bowl. Add the 4 tablespoons of cubed salted butter, 3 egg yolks, 1/2 teaspoon salt, and 1/4 teaspoon white pepper. Mix thoroughly until the potatoes are smooth and creamy.

Spoon the fish and vegetable filling evenly into an oval-shaped baking dish (approximately 9x13 inches). Transfer the mashed potatoes to a piping bag fitted with a large star tip (or use a spoon/spatula). Pipe or spread the mashed potatoes evenly over the fish filling, covering it completely.

Use a palette knife or the back of a spoon to create a decorative pattern on the surface of the mashed potatoes, such as scallops or scales. Place the baking dish on a baking sheet to catch any potential drips.

Bake in the preheated oven for 30-35 minutes, or until the mashed potato topping is beautifully golden brown and the filling is bubbling around the edges. Let rest for a few minutes before serving.
