-
1
Preheat oven to 425 degrees F (220 degrees C). Grease two 2-cup baking dishes.
-
2
Bring the clam juice to a simmer in a small pot. Place salmon fillet into clam juice; poach until fish flakes easily with a fork, about 10 minutes. Remove salmon to a plate; reserve poaching liquid.
-
3
Heat olive oil and butter in a skillet over medium heat. Stir in carrot, celery, leek, and shallot; cook and stir until vegetables are tender, about 5 minutes. Whisk flour into vegetable mixture; cook and stir until flour is golden, about 5 minutes.
-
4
Whisk reserved poaching liquid and cream into vegetable mixture; return to a simmer and cook, stirring occasionally, until sauce thickens, about 3 minutes. Stir dill and lemon juice into mixture; season with salt and pepper.
-
5
Break salmon fillet into bite-size pieces; divide into prepared baking dishes. Cover salmon with 1/3 the sauce; layer 5 shrimp into each dish. Cover shrimp with 1/3 the sauce; divide smoked salmon evenly into each dish. Top with remaining 1/3 the sauce.
-
6
Roll out puff pastry sheet 1/8-inch thick on a lightly floured surface. Cut two pastry circles large enough to cover the baking dishes and place one circle over each dish. Place dishes on a baking sheet.
-
7
Bake in the preheated oven until pastry is risen and golden brown, about 15 minutes. Cool for 5 minutes before serving.