Sole Filets Stuffed with Spinach Mousse

1 tablespoon lemon juice 1/2 cup spinach , cooked and squeezed 1 egg white 8 fluid ounces heavy cream 1/4 lb mushroom , sliced 8 fluid ounces fish stock 2[...]

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[...]