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1
Heat oil in heavy large pot over medium-high heat.
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2
Add onions, carrots, thyme and bay leaf.
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3
Saute until tender, about 10 minutes.
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4
Add 4 1/2 cups broth and wine.
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5
Bring to boil.
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6
Reduce heat; cover pot partially.
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7
Simmer 40 minutes, stirring occasionally and skimming off fat if necessary.
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8
Strain into 4-cup glass measuring cup, pressing on solids; discard solids.
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9
Add more broth if necessary to measure 4 cups, or return broth to pot and boil until reduced to 4 cups.
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10
(Can be made 1 day ahead.
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11
Cool to room temperature.
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12
Cover; chill.)
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13
Position rack in bottom third of oven and preheat to 325F.
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14
Place roasting rack in shallow roasting pan.
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15
Sprinkle pork generously with salt and pepper.
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16
Set pork, fat side up, on rack in roasting pan.
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17
Roast until thermometer inserted into thickest part of pork registers 180F, about 3 hours.
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18
Transfer to cutting board.
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19
Tent with foil.
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20
Scrape pan juices into 1-cup glass measuring cup.
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21
Spoon off fat.
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22
Reserve juices.
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23
Melt 2 tablespoons butter in heavy large skillet over medium heat.
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24
Add all mushrooms.
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25
Cover and cook until tender, stirring often, about 10 minutes.
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26
Pour pan juices and 4 cups broth into mushrooms.
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27
Bring to simmer.
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28
Mix 4 tablespoons butter and flour in small bowl to form paste.
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29
Add mustard.
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30
Gradually whisk paste into skillet.
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31
Cook until gravy thickens slightly, whisking occasionally, about 5 minutes.
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32
Serve pork with gravy.