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1
Preheat oven to 400 degrees F.
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2
Bring a large pot of salted water to boil for pasta.
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3
While the sauce cooks, add the shells to the boiling pasta water and cook two-thirds of the recommended cooking timeshells should still be firm.
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4
Drain and set all the shells on sheet trays, set apart so they wont stick to each other.
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5
For the sauce: Heat the olive oil in a Dutch oven over medium heat.
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6
Saute the garlic until the edges are golden, about 2 minutes, then pour in the tomatoes.
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7
Slosh out the tomato cans with 1 cup hot water each, and add that to the pot.
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8
Stir in the salt, oregano, and peperoncino, and bring to a rapid simmer.
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9
Cook, uncovered, until thickened, about 20 minutes.
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10
For the filling: Stir together the ricotta, peas, cubed mozzarella, 1 cup of the grated Grana Padano or Parmigiano-Reggiano, the parsley, and egg in a bowl.
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11
Mix the shredded mozzarella and remaining grated Grana Padano or Parmigiano-Reggiano in a bowl, and set aside.
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12
Spread 2 cups of the sauce in a 15-by-10-inch Pyrex or ceramic baking dish.
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13
Stuff each shell with a tablespoon of the stuffing, and arrange in the baking dish.
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14
Divide any remaining stuffing between and around the stuffed shells.
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15
Top evenly with 2 cups more sauce, and sprinkle with the reserved grated-cheese mixture.
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16
Dollop the remaining sauce evenly over the top.
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17
Make a tent with foil over the baking dish.
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18
Bake, and after 25 minutes, check: the sauce should be bubbly all over.
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19
Remove foil, and bake until golden and crusty, 5 to 10 minutes more.