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1
Preheat a grill or panini maker.
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2
Brush the onion slices on both sides with the olive oil.
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3
Sprinkle with the salt and pepper.
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4
Grill the onion slices until tender and lightly browned, 3 to 4 minutes per side.
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5
Set aside to cool.
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6
Pull out and remove some of the bread from each half of the rolls.
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7
Spoon half of the sauce over the bottom halves of the rolls.
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8
Sprinkle with red pepper flakes if using.
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9
Add the arugula, meatballs, prosciutto slices, grilled onions and the remaining sauce.
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10
Place 2 slices of cheese on top.
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11
Add the tops of the rolls and drizzle with olive oil.
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12
Using a pastry brush, brush the oil evenly over the tops.
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13
Place the sandwiches in a panini maker and cook until the cheese has melted and the meatballs are heated through, about 5 minutes.
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14
Cut the panini in half and serve.
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15
Preheat the oven to 400 degrees F.
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16
In a large bowl, combine the breadcrumbs, Parmesan, basil, parsley, milk, tomato paste, salt, pepper, eggs, garlic and onions.
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17
Using a wooden spoon, stir to blend.
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18
Add the ground turkey and sausage meat.
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19
Using fingers, gently mix all the ingredients until thoroughly combined.
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20
Using a 1-ounce cookie scoop or a small ice cream scoop, form the meat mixture into 1 1/2-inch balls (22 to 24 meatballs).
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21
Place the meatballs on a heavy nonstick baking sheet, spacing apart.
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22
Drizzle with olive oil and bake until cooked through, 15 minutes.
