Brown the beef deeply. Heat a 6-quart (or larger) dutch oven or heavy-bottomed pot over high heat. Add the ground beef and break it into small pieces using a wooden spatula. Cook on medium-high for 18–22 minutes, stirring every 2–3 minutes, scraping up the brown bits, until the beef is evenly browned and caramelized. The meat will release liquid while cooking. Let it evaporate naturally. As the pot begins to dry, add up to 2 tablespoons butter and continue cooking until deeply browned and fragrant.
2 lb ground beef, 4 tablespoon unsalted butter
Cook the soffritto. Add the finely diced onion, celery, carrots, 1 teaspoon of salt, and remaining 2 tablespoons butter to the pot. Stir to combine and cook over medium heat for about 8 minutes, until the vegetables are softened and the onions are translucent.
1 medium sized yellow onion, 2 celery ribs, 1 carrot
Toast the tomato paste. Make a well in the center of the pot, and add the tomato paste. Allow to toast in the center undisturbed for a minute, then stir well so the beef and vegetables are evenly coated. Cook for 2–3 minutes to remove the raw edge from the tomato paste. Be careful not to burn! Reduce the heat to low and add the bay leaves.
1 cup tomato paste
Add liquids and reduce. Pour in 2 cups of whole milk and stir. Let simmer gently for about 20 minutes, stirring occasionally to prevent sticking, until the milk has mostly reduced and the sauce thickens. Then, pour in 1.5 cups of broth and simmer again for about 20 minutes, stirring occasionally, until reduced and cohesive. Add in the nutmeg.
4 cups whole milk, 3 cups broth, 3 bay leaves, 2 teaspoon kosher salt, 1 pinch nutmeg
Repeat the milk and broth process once more. Add the remaining 2 cups milk and simmer for 20 minutes until reduced, then add the remaining 1.5 cups broth and simmer for another 20 minutes until thick and silky. Remove the bay leaves. The sauce should be rich, concentrated, and no longer soupy. (If you have extra time, you can let it gently simmer longer — it only improves.)
Cook the pasta. Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Reserve 1 cup of pasta water before draining. Do not rinse.
1 lb fusilli pasta
Finish the pasta in the sauce. Add the drained pasta directly to the pot of bolognese. Add about ¼ cup of reserved pasta water and stir over low heat for 1–2 minutes, adding more pasta water as needed, until the sauce fully coats the pasta and looks glossy.
Serve and top. Spoon into bowls and top generously with freshly grated parmesan before serving.
½ cup fresh grated parmesan cheese