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To butterfly the tenderloins: make a deep lengthwise cut down the center, being careful not to cut all the way through.
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2
Open the tenderloin up like a book.
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3
Place the opened tenderloin between 2 pieces of plastic wrap.
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Pound with a meat mallet until 1/4-inch thick.
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5
Repeat with the other tenderloin.
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6
To make the stuffing: heat the olive oil in a large skillet over medium heat.
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Add the onion and cook until lightly golden, about 6 to 8 minutes.
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Add the garlic and cook 1 minute more.
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Add the kale, vinegar, honey, and water.
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Increase the heat to high and continue to cook, stirring constantly, until the kale is wilted, about 2 minutes.
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Drain and set aside.
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Lay 2 slices of ham or prosciutto over each butterflied tenderloin.
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Top with half of the kale stuffing, leaving a 1/4-inch border.
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14
Carefully open the peppers and lay a single layer over the kale.
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15
Roll up each tenderloin and tie at 2-inch intervals with butcher's twine.
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16
Preheat the oven to 450 degrees F.
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Sprinkle the tenderloins all over with salt and pepper.
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Heat a heavy ovenproof skillet over medium-high heat and add the olive oil.
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Place the tenderloins in the pan and brown on all sides for about 3 to 5 minutes.
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Transfer the pan to the oven and roast.
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After 15 minutes, begin checking the internal temperature with an instant-read thermometer, checking every 5 minutes, until the pork registers 140 degrees F to 145 degrees F. When done, remove the tenderloins from skillet to a platter, cover loosely with foil, and set aside to rest for 10 minutes.
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22
Remove the twine from the tenderloins, cut them into 1/2-inch-thick slices, and serve with Romesco sauce.
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23
Romesco sauce:
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1/2 cup toasted almonds
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1/2 fresh bread crumbs
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3 tablespoons olive oil
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8 ounces piquillo peppers or fire roasted red bell peppers or pimentos
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1 tablespoon capers, drained
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Kosher salt
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Fresh ground pepper
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For the Romesco sauce: In a food processor fitted with the metal blade, grind the almonds until they form a thick paste.
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Add the bread crumbs, olive oil, peppers, and capers and process until smooth.
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Taste for salt and pepper.
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Transfer to a serving bowl.