Pulse onion, celery, and carrot in a food processor until very finely chopped. Transfer to a small bowl.
Heat oil in a large pot over medium. Break beef into small clumps (about 1½") and add to pot; season lightly with salt. Cook, stirring occasionally but not breaking meat apart, until beef is lightly browned but not crisp, 6–8 minutes. It may be gray in spots (that’s okay!) and still a little pink in the center. Using a slotted spoon, transfer beef to a medium bowl.
Wipe out pot. Cook pancetta in pot over medium heat, stirring occasionally, until pancetta has released some of its fat and is crisp, 6–8 minutes. Add onion mixture to pot and cook, stirring occasionally, until vegetables are very soft and beginning to stick to surface, 6–8 minutes.
Return beef to pot and pour in wine. Reduce heat to medium-low and cook, smashing down on beef with a wooden spoon, until wine is evaporated, surface of pot is almost dry, and meat is finely ground, 12–15 minutes. (The meat should be reduced to what looks like little bits. It takes a bit of effort, but you can take breaks.) Add tomato paste, bay leaf, and nutmeg and cook, stirring occasionally and still pressing down on meat, until tomato paste is slightly darkened, about 5 minutes.
Pour stock and milk into pot; add a pinch of salt. Reduce heat to the lowest setting and cook, uncovered and stirring occasionally, until meat is very, very tender, 2–2½ hours. There shouldn’t be any rapid bubbles at this stage. Instead, the sauce should release the occasional small bubble or two. When finished, the sauce should have the texture of and look like a sloppy joe mixture. If the liquid reduces before the meat is completely tender, add an extra ½ cup stock and continue cooking. Discard bay leaf. Taste sauce and adjust seasoning with salt; keep warm.
Cook pasta in a large pot of boiling salted water. If using fresh pasta, cook about 3 minutes. If using dry, cook until very al dente, about 2 minutes less than package directions.
Using tongs, transfer pasta to pot with sauce. Add 1 cup pasta cooking liquid and ½ cup Parmesan. Increase heat to medium, bring to a simmer, and cook, tossing constantly, until pasta is al dente and liquid is slightly thickened, about 2 minutes.
Transfer pasta to a platter and top with more Parmesan.
Do Ahead: Sauce can be made 4 days ahead. Cover and chill.
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|Serving Size: 1 (1140g)|
|Recipe Makes: 1|
|Calories from Fat: 377 (82%)|
|Amt Per Serving||% DV|
|Total Fat 41.9g||56 %|
|Saturated Fat 6.2g||31 %|
|Monounsaturated Fat 29.8g|
|Polyunsanturated Fat 4.5g|
|Cholesterol 3mg||1 %|
|Sodium 241.6mg||8 %|
|Potassium 394.7mg||10 %|
|Total Carbohydrate 11.3g||3 %|
|Dietary Fiber 2.8g||11 %|
|Sugars, other 8.5g|
|Protein 2g||3 %|
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Disclaimer: Nutrition facts are derived from linked ingredients (shown at left in colored bullets) and may or may not be complete. Always consult a licensed nutritionist or doctor if you have a nutrition-related medical condition.
Calories per serving: 462
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