shrimp and talapia fish chowder

Ingredients

• 1 - half pkg.{450g}frozen puff pastry
• 1 - egg
• 2 tablespoons butter
• 1 - leek, white part and only 1 inch green part thinly sliced
• 2 tablespoons all purpose flour
• 1 cup low sodium chicken brorh
• 1/2 cup clam juice
• 1/2 cup 10% cream
• 1 pound frozen large shrimp,peeled and deveined and tails removed
• 1 pound tilapia or other white fish to your taste cut in 1 inch pieces
• 1 teaspoon lemon zest
• 2 tablespoons lemon juice, fresh
• 1/4 teaspoon pepper
• 1/2 teaspoon fine sea salt
• 1/2 cup grated parmesan cheese
• 1 tablespoon chopped fresh tarragon