Ingredient:

• ½ cup unsalted butter
• 1 ½ cups thinly sliced yellow onion
• 1 cup thinly sliced fennel
• 1 cup thinly sliced celery
• 1 cup thinly sliced carrots
• ½ cup all-purpose flour
• ½ cup dry white wine
• 3 cups fish stock
• ¼ cup heavy cream, divided
• 1 tablespoon kosher salt
• ½ teaspoon ground black pepper
• 1 (8 ounce) fillet halibut, skin removed, cut into 1-inch pieces
• ½ pound sea scallops, halved horizontally
• ½ pound peeled and deveined medium shrimp
• 1 pound jumbo lump crabmeat, picked over
• 1 cup frozen green peas
• 2 tablespoons chopped fresh parsley, plus more for garnish
• 1 large egg, lightly beaten
• 1 (17.3 ounce) package frozen puff pastry sheets, thawed