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1
Preheat the oven to 400F.
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2
In a large bowl, combine the sausage, beef, 4 cups of the breadcrumbs, the pecorino, eggs, milk, and salt and pepper.
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3
Mix gently but thorougly with your hands.
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4
Cover and refrigerate.
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5
Bring 8 quarts of water to a boil in a large pasta pot.
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6
Set up an ice bath nearby.
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7
Add 2 tablespoons salt to the boiling water.
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8
Dip the spinach leaves in the water just to wilt them, immediately transfer them to the ice bath, then drain them in the colander.
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9
Add the carrots to the boiling water and cook for 10 minutes, then remove with a spider or slotted spoon and set aside.
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10
Drop the scallions into the boiling water and cook for 1 minute.
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11
Drain and set on a towel-lined plate.
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12
Combine the flour with the remaining 1/4 cup breadcrumbs, and heavily dust a wooden board or work surface with the mixture.
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13
Place the spinach leaves between two plates and press them together to remove remaining water, and then lay the spinach over the meat, leaving a 1-inch border on the short sides.
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14
Lay the carrot pieces and then the scallions over the spinach, arranging them lengthwise down the rectangle.
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15
Lay the mortadella and Cacio di Roma over the scallions.
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16
Starting from a long side, roll the meat up like a jelly roll, making it as compact as possible; patch any holes like modeling clay.
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17
The roll should be about 16 inches long.
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18
Dust the outside with flour.
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19
Place the loaf (on a diagonal if necessary) on a rimmed baking sheet, and press a sprig of rosemary onto each side of the polpettona and pour 1 cup of water into the pan.
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20
Drizzle 1/2 cup of the olive oil down the length of the loaf.
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21
Bake the polpettona for 1 hour, or until it reaches an internal temperature of 165 F.
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22
Carefully transfer the loaf to a cutting board and allow it to rest for 15 minutes.
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23
Strain pan juices into a saucepan and bring to a boil, season with salt and pepper to taste, add the remaining 1/4 cup oil and whisk to form a loose sauce.
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24
Slice the meatloaf into 1 inch-thick slices, drizzle with sauce and serve.
