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1
Place the wine, garlic, pepper, and salt in 13-by-9-inch baking dish and whisk to combine.
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2
Add the steak pieces, turn to coat, cover, and refrigerate for 2 hours, turning once.
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3
Heat an outdoor grill to high (about 450 degrees F to 550 degrees F).
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4
Meanwhile, prepare the skewers: Thread half of the mushrooms onto 1 skewer through the center of the cap and out through the stem.
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5
Repeat with the remaining mushrooms on a second skewer.
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6
Thread equal amounts of onion onto the remaining 2 skewers, leaving 1/4 inch in between the onion pieces.
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7
Brush the mushrooms and onions all over with vegetable oil.
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8
Then brush the mushrooms all over with a thin layer of Worcestershire sauce; set the mushroom skewers and the remaining Worcestershire sauce aside.
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9
Season the onion skewers with salt and pepper; set aside.
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10
Rub the grill grates with a towel dipped in vegetable oil.
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11
Place the bacon flat on the grill, cover the grill, and cook, flipping halfway through, until the bacon is crisp, about 5 minutes total.
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12
Remove to a medium bowl to cool, then crumble and set aside.
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13
Place the mushroom and onion skewers on the grill and cover the grill.
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14
Cook, brushing the mushrooms with the reserved Worcestershire sauce every 2 minutes and rotating all of the skewers until the mushrooms and onions have charred and are slightly softened, about 13 to 15 minutes total.
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15
(You may have some Worcestershire sauce left over.)
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16
Remove the skewers to a baking sheet or large dish, cover with foil, and set aside.
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17
Remove the steak from the marinade and pat dry with paper towels; discard the marinade.
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18
Rub the grill grates again with oil.
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19
Place the steak on the grill, cover the grill, and cook until medium rare, flipping halfway through, about 5 to 6 minutes total.
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20
Remove to a cutting board and let rest while you finish the topping.
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21
Remove the mushrooms and onions from the skewers.
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22
Cut the mushrooms into quarters and add to the bowl with the bacon.
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23
Coarsely chop the onions and add them to the bowl.
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24
Add the blue cheese and parsley and stir to combine.
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25
Taste and season with salt and pepper as needed.
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26
Slice the skirt steak and serve with the topping.