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1
Wash the spinach three times in cold water and place it, still wet, in a large pot.
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2
Heat, stirring, until it wilts.
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3
Drain and refresh under cold water, drain and set aside.
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4
In a large pot, heat 1 tablespoon butter.
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5
Add shallots and curry powder and cook 2 minutes, stirring.
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6
Add wine, cook 3 minutes longer.
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7
Add mussels, cover and cook over high heat until they open, 8 minutes.
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8
Transfer mussels from the pot with a slotted spoon to a big warm bowl, discarding any that have not opened.
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9
Cover the bowl with a clean towel wrung out in hot water.
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10
Strain the mussel liquid through a coffee filter or cheesecloth, and place it in a clean, medium saucepan.
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11
Cook over high heat until reduced by half.
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12
Add the heavy cream, and reduce again by about half, until the sauce is just a little thicker than plain heavy cream.
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13
Stir in the chives and two tablespoons butter, and season to taste with salt and pepper.
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14
Heat the remaining butter in a pan.
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15
Press excess moisture from spinach, add it and cook until just heated.
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16
Divide it among four large, shallow soup plates (if serving as a main course) or six plates (for a first course).
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17
Pull off and discard one shell from each mussel, and arrange mussels on the half shell on the spinach.
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18
Reheat the sauce, spoon it over the mussels and serve at once.