Thaw pastry and cut into one and a half inch squares,brush with beaten egg and sprinkle lightly with sea salt. Place on parchment lined baking sheet and bake in 400F oven until puffed and golden about 18 to 20 minutes..remove from oven and sprinkle with parmesan cheese while hot and set aside on wire rack to cool.
I large skillet melt butter and cook leeks stirring occasionally until softened about 4 to 5 minutes, add flour. cook stirring for 1 minute stir in broth, clam juice and cream cook and stir until thickened about 3 to 4 minutes..add shrimp, fish, tarragon, zest, lemon juice and pepper..cook over medium heat until shrimp is pink and fish is opaque about 5 to 6 minutes...divide among. soup bowls and serve with puff pastry squares