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1
Preheat the oven to 350 degrees F.
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2
For the pork and broccoli rabe: Butterfly the pork, cut the meat across, but not all the way through, and open the shoulder up like a book.
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3
If the meat is a little uneven, then pound it out to even.
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4
Sprinkle the pork evenly across the surface with the rosemary, fennel seeds, red pepper flakes, garlic and some salt and pepper.
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5
Grate the onion over the meat with the large side of a box grater or with a wide tooth fine grater and spread it around the meat.
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6
Roll and tie the pork with kitchen string to secure.
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7
If using, rub the skin with the baking soda for extra crispy skin.
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8
Drizzle or spray with a little oil and sprinkle with salt and pepper.
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9
Roast the pork on the center rack, covered with foil, to an internal temperature of 145 degrees F, about 2 1/2 hours.
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10
Remove the foil and broil to crisp the skin, 15 to 20 minutes.
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11
Let the pork rest before slicing.
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12
Bring a few inches of water to a boil in a deep skillet.
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13
Salt the water, then add the rabe and boil to cook out the bitterness, 5 to 7 minutes.
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14
Drain.
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15
For the gremolta: Place the lemon zest on a cutting board and pile the parsley, garlic and chiles on top.
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16
Finely chop them all together to combine them.
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17
Cut the zested lemon into 10 wedges.
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18
Toast the split ciabatta and drizzle with EVOO.
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19
Arrange 3 to 4 thin slices of pork in sandwich and douse with a squirt of lemon juice, top with gremolata and rabe and set tops in place.