Pasta With Classic Bolognese Sauce

1. Melt 3 tablespoons butter in Dutch oven over medium heat. Add onion, carrot, and celery and cook until softened, 5 to 7 minutes. Stir in meatloaf mix and 1⁄2 teaspoon salt and cook, breaking up any large pieces with wooden spoon, until no longer pink, about 3 minutes.
2. Stir in milk, bring to simmer, and cook until milk evaporates and only rendered fat remains, 10 to 15 minutes. Stir in wine, bring to simmer and cook until wine evaporates, 10 to 15 minutes. Stir in tomatoes and reserved tomato juice and bring to simmer. Reduce heat to low so that sauce continues to simmer just barely, with occasional bubble or two at surface, until liquid has evaporated, about 3 hours. Season with salt to taste. (Sauce can be refrigerated for up to 2 days or frozen for up to 1 month.)
3. Meanwhile, bring 4 quarts water to boil in large pot. Add pasta and 1 tablespoon salt and cook, stirring often, until al dente. Reserve 1⁄2 cup cooking water, then drain pasta and return it to pot. Add sauce and remaining 2 tablespoons butter to pasta and toss to combine. Add reserved cooking water as needed to adjust consistency. Serve, passing Parmesan separately.

BEEF BOLOGNESE SAUCE
Substitute 12 ounces 85 percent lean ground beef for meatloaf mix.