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1
Melt 1 tablespoon of the butter in a saucepan.
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2
Add the flour and stir with a wire whisk until blended.
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3
Add the milk and cream all at once.
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4
Stir rapidly with the whisk.
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5
Bring to a boil and add the Gruyere cheese.
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6
Stir until the cheese has melted.
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7
Add the egg yolk, stirring rapidly with the whisk.
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8
Add salt, pepper, nutmeg and cayenne.
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9
Simmer, stirring, for 1 minute.
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10
Set aside, cover and keep warm.
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11
Pick over spinach and discard any tough stems.
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12
Wash spinach thoroughly to remove any sand.
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13
Put spinach in a large saucepan, add salt and cook over high heat, stirring, until wilted, about 2 minutes.
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14
Drain well and squeeze out excess moisture.
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15
Set aside and keep warm.
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16
Preheat the oven to 450 degrees.
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17
Grease a metal baking dish with 1 tablespoon of the butter.
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18
Scatter the shallots over the dish.
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19
Neatly arrange the pieces of codfish over the shallots.
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20
Season with salt and pepper.
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21
Add the wine, cover with foil and bring to a boil on top of the stove.
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22
Put the dish in the oven and bake 5 minutes.
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23
Select a baking dish large enough to hold the fish in one layer.
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24
Spread the remaining 1 tablespoon butter over the bottom of the dish.
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25
Spoon the spinach over the bottom and carefully transfer the cooked codfish over the spinach, reserving the wine liquid in the first dish.
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26
Reduce by half the wine liquid in the metal baking dish and add it to the cheese sauce.
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27
Bring to a boil, stirring with a wire whisk.
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28
Spoon the hot sauce over the fish, smoothing it over to cover the fish.
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29
Sprinkle with Parmesan cheese.
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30
Turn on the broiler unit and put the dish under the broiler with the door open until nicely browned and bubbling.