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1
In a food processor, combine the 1 3/4 cups of flour with a pinch of salt.
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2
Add the whole egg, 5 of the egg yolks and 1 tablespoon of water and process until a crumbly dough forms, about 2 minutes.
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3
Turn the dough out onto a work surface and knead until smooth; if the dough is too tough to knead, add another tablespoon of water.
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4
Wrap the dough in plastic and let stand at room temperature for 30 minutes.
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5
Unwrap the dough and divide it into 3 pieces.
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6
Work with 1 piece at a time and keep the rest covered.
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7
Press the dough to flatten it slightly.
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8
Using a hand-cranked pasta machine set at the widest setting, roll the dough through successively narrower settings to the thinnest one.
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9
Lay the pasta on a lightly floured work surface, sprinkle with flour and cover with wax paper.
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10
Repeat with the remaining dough, dusting with flour and layering between wax paper.
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11
Using a 2 1/4-inch fluted biscuit cutter, stamp out rounds from the pasta sheets.
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12
Cover with plastic wrap.
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13
In a bowl, combine the ricotta with 1/3 cup of the Parmigiano-Reggiano, the spinach, oil and nutmeg and season with salt and pepper.
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14
Transfer the filling to a pastry bag fitted with a 1/4-inch round tip or to a sturdy plastic bag with a corner snipped off.
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15
In a small bowl, combine the 2 remaining yolks with 1/4 cup of water.
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16
Working with one dough round at a time, lightly brush the edge with the egg wash.
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17
Pipe a scant 1/2 teaspoon of the filling in the center and fold the dough over the filling to form a half moon; press the edge to seal.
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18
Lightly brush the dough with water if dry.
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19
Bring the ends of the half moon together around your finger, overlapping them slightly and pressing them together.
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20
Fill and shape the remaining tortelli, transferring them to a tray lined with floured wax paper.
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21
Bring a large pot of salted water to a boil.
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22
Add the tortelli and cook, stirring occasionally, until they rise to the surface and the pasta is cooked through, 7 to 8 minutes, then drain, reserving 1/4 cup of the water.
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23
Transfer the tortelli to a large bowl.
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24
In a large skillet, cook the butter over moderately high heat until lightly browned, 5 minutes.
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25
Stir in the tortelli, the reserved pasta water and the remaining 1/4 cup of grated cheese.
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26
Serve right away.