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1
Bring broth to simmer in heavy small saucepan over medium-high heat.
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2
Add marrow; reduce heat to low and poach gently until marrow looks translucent and gray, about 2 minutes.
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3
Using slotted spoon, transfer marrow to small plate.
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4
Refrigerate marrow poaching liquid.
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5
Refrigerate marrow until cold and firm, about 45 minutes.
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6
Dice marrow finely; cover and chill.
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7
(Can be made 1 day ahead.
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8
Keep marrow and poaching liquid chilled.)
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9
Melt 1 tablespoon butter in heavy medium skillet over medium-high heat.
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10
Add shallot and saute until translucent, about 3 minutes.
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11
Add wine and boil until reduced to scant 1/2 cup, about 5 minutes.
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12
Transfer reduction to small bowl.
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13
Melt 2 tablespoons butter in heavy large skillet over high heat.
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14
Sprinkle steaks lightly with salt and pepper.
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15
Add to skillet and sear until cooked to desired doneness, about 3 minutes per side for medium-rare.
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16
Transfer steaks to plates.
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17
Add wine reduction to skillet and bring to boil, scraping up browned bits.
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18
Reduce heat to medium.
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19
Whisk in remaining 3 tablespoons butter, 1 tablespoon at a time.
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20
Add 1/4 cup reserved marrow poaching liquid and diced marrow.
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21
Cook until marrow melts and sauce is smooth, whisking constantly, about 2 minutes.
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22
Thin sauce with more poaching liquid by tablespoonfuls, if desired.
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23
Season sauce with salt and pepper.
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24
Spoon sauce over steaks.
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25
Sprinkle with parsley.