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1
Place one oven rack on lowest level and one rack on the next level above.
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2
Heat oven to 500 degrees F.
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3
Forty minutes before roasting the steak and mushrooms, use a fork to prick the potatoes once or twice each.
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4
Place them directly on the sides of the upper rack of the oven, allowing enough room for the mushrooms, which will cook on the same rack.
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5
Put the garlic in the blender or food processor with 4 tablespoons of the oil.
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6
Blend until smooth.
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7
Scrape down the sides with a rubber spatula.
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8
Add remaining oil and salt and pepper.
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9
Blend until smooth.
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10
Put the mushrooms in a 12x8x1 1/2-inch roasting pan.
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11
Using the spatula, scrape out half the garlic mixture into the pan.
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12
Rub the puree into both sides of each mushrooms cap.
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13
Allow to marinate for at least 30 minutes.
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14
Put steak in shallow container large enough to hold it.
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15
Pour remaining garlic mixture over and rub into both sides of steak.
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16
Let marinate on kitchen counter at least 30 minutes or until meat comes to room temperature.
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17
Before roasting the steak and mushrooms, put a roasting pan on the lower oven rack and preheat for 10 minutes.
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18
Remove pan.
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19
Immediately, put the steak with all of its marinade in the pan.
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20
Place on the lower rack, the thickest part of the steak to the rear of the oven.
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21
Place the mushrooms on the upper rack at the same time.
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22
For rare, roast the steak on one side for 6 minutes(for medium, 8 minutes).
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23
Turn the steak and, ushrooms.
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24
Roast 6 minutes more.
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25
Remove steak, mushrooms and potatoes from the oven.
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26
Let steak rest about 5 minutes, Slice thinly against the grain.
