Sole Stuffed With Spinach

1 1/4 pounds sole fillets 1 cup crab meat 1 each egg yolk * 2 tablespoons parsley leaves chopped 1 tablespoon bread crumbs 1/4 cup butter melted 2 tablespoons[...]

1 tablespoon lemon juice 1/2 cup spinach cooked and squeezed 1 each egg white * 1 cup heavy whipping cream 1/4 pound mushrooms sliced 1 cup fish stock 2[...]