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1
Cut six 14- x 12-inch pieces of parchment paper; cut each into a large heart shape. Fold in half; open out flat, and lightly butter exposed surface. Set aside.
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2
Combine water, 1 teaspoon salt, thyme, bay leaf, and lemon slices in a large Dutch oven; bring to a boil. Add fillets; reduce heat and simmer, uncovered, 15 minutes or until fish flakes easily when tested with a fork. Remove fillets from fish stock; set aside. Strain stock into a 2-cup glass measure; add water to yield 1 1/2 cups. Set stock aside; discard bay leaf and lemon slices.
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3
Saute onion in butter in Dutch oven over low heat until tender. Gradually add flour, stirring until well blended. Cook 1 minute, stirring constantly. Gradually add reserved fish stock; cook over medium heat, stirring constantly, until slightly thickened. Gradually stir one-fourth hot mixture into yolks; add to remaining hot mixture, stirring constantly. Stir in remaining salt, shrimp, crab meat, and mushrooms.
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4
Place one fillet on half of each paper heart; top each with 1/2 cup shrimp mixture. Fold paper edges over to seal securely. Carefully place parchment bags on baking sheets. Bake at 400u00b0 for 10 minutes or until bags are puffed and lightly browned.
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5
Transfer bags to serving plates. Cut an opening in bags, and serve.
