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1
Heat a large, heavy skillet over medium heat.
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2
When hot, add the oil, then the garlic, and stir for 10 seconds.
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3
Add the spinach a handful at a time, stirring and adding more as it wilts in the pan.
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4
When all the spinach has been added, season with salt and pepper to taste.
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5
Cook for a few minutes, stirring constantly, until all the spinach is wilted.
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6
Add the cream and simmer 5 to 7 minutes, stirring frequently, until the cream has been absorbed and reduced almost entirely.
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7
Set the pan aside to cool.
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8
(If making the day before, transfer the spinach to an airtight container and refrigerate overnight.)
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9
Stir the breadcrumbs and Parmesan together in a small bowl.
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10
Season with salt and pepper, and set aside (or refrigerate overnight).
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11
Preheat the broiler on high heat.
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12
Fill a rimmed baking sheet with a layer of kosher salt about 1/2 inch deep and arrange the baking sheet about 3 inches from the heating element.
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13
Nestle the curved part of the oyster shells into the salt.
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14
Divide the spinach mixture between the 12 shells.
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15
Top each pile of spinach with a raw oyster, then sprinkle each oyster with a tablespoon of the breadcrumb mixture.
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16
Dot each oyster with a tiny piece of butter, and broil for about 3 minutes, rotating the pan if necessary, or until the breadcrumbs are evenly browned, the oysters are cooked, and the spinach is warmed through.
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17
Serve immediately.
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18
Variations:
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19
Substitute sea scallops for the oysters.
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20
Use scallop shells (available in fish shops) and broil about 4 minutes, depending on the size of the scallops, or until just cooked through.
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21
Substitute raw clams for the oysters and broil for 2 to 3 minutes.