PAUPIETTES OF SOLE WITH SPINACH AND MUSHROOM STUFFING

Steps:

• Sprinkle the fillets with salt and pepper and set aside.
• Pick over the spinach. Remove and discard any tough stems and blemished leaves. Rinse and drain the spinach well. There should be about 8 cups loosely packed. Set aside.
• Heat the butter in a skillet and add the shallots. Cook briefly, stirring, and add the mushrooms, salt, pepper and nutmeg. Cook, stirring, until the mushrooms are wilted. Add the spinach and cook until wilted. Continue cooking until all the moisture evaporates.
• Scrape the mixture into a bowl and add the egg yolk. Let stand until cool.
• Place the fillets of fish on a flat surface, skinned side up. Spoon an equal portion of the spinach and mushroom mixture onto the center of each fillet. Roll the fillets jellyroll style to enclose the filling.
• Bring a quantity of water to the boil in the bottom of a steamer. Arrange the rolled fillets, seam side down, on a steamer rack. Set the rack over the steamer bottom. Steam five minutes. Serve hot with a ginger butter sauce (see recipe).