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1
Heat oil in a large heavy pot over medium high heat.
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2
Add onions, celery and carrots.
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3
Saute' until soft 8 - 10 minutes.
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4
Add beef, veal and pancetta; saute, breaking up with the back of the spoon, until browned.
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5
about 15 minutes.
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6
Add wine; boil 1 minute, stirring often and scraping up browned bits.
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7
Add 2 1/2 cups stock and tomato paste; stir to blend.
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8
Reduce heat to very low and gentle simmer, stirring occasionally, until flavours meld.
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9
Season with salt and pepper.
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10
Bring milk to a simmer in a small sauce pan; gradually add to sauce.
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11
Cover sauce with lid slightly ajar and simmer over low heat, stirring occasionally, until milk is absorbed, about 45 minutes, adding more stock by 1/4 cup to thin if needed.
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12
DO AHEAD: Ragu' can be made 2 days ahead.
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13
Chill uncovered and keep chilled.
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14
Rewarm before continuing.
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15
Bring large pot of water to boil.
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16
Season with salt; add pasta and cook, stirring occasionally, until 1 minute before al dente.
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17
Drain, reserving 1/2 cup of pasta water.
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18
Transfer Ragu' to a large skillet over medium high heat.
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19
Add pasta and toss to coat.
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20
stir in some of the reserved pasta water by tablespoons if sauce seems dry.
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21
Divide pasta among warm plates.
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22
Serve with Parmesan cheese.