To be upfront, this isn't one of those slow-cooker recipes that instructs you to throw everything in a pot, set it, and forget it. It demands a bit more respect (and a bit more work) from you than that. What it is is a recipe for supper success, as once you've invested the initial time to chop and brown all of the ingredients — about an hour of meditative work — you can go about your merry day knowing that you'll return to a luxe dinner.
Tossed with pappardelle and sprinkled with parmesan shavings, it's a dish that'll woo both you and whoever you're so kind as to share it with. And, unless you're cooking dinner for a crowd, it's generous with leftovers; tuck an airtight container of sauce in the freezer and rest easy knowing you have a stash of dinner gold to dip into whenever you need a pick-me-up in the midst of a busy week.
Adapted from Year-Round Slow Cooker: 100 Favorite Recipes For Every Season by Dina Cheney
Add the dried mushrooms to a small bowl and cover with very hot water; let sit for 15 minutes, then drain and finely chop. In a large bowl, mash the bread and milk together until a smooth paste forms. Gently knead in the ground meat, salt, and pepper, and mix well.
Add the butter to a large straight-sided, heavy-bottomed skillet and heat over medium-high heat. When melted, add the pancetta and sauté until browned, about 8 minutes. Transfer the pancetta to a large mixing bowl and pour off all but 2 tablespoons of the fat from the pan. Cook about half of the ground meat mixture until browned; transfer to the bowl with the pancetta. Repeat with the remaining ground meat. Add the fresh porcini and cook until softened, about 2 minutes. Stir in the dried mushrooms, carrots, celery, onions, garlic, and nutmeg. Sauté until the vegetables are slightly softened and aromatic, about 3 minutes. Add the tomato paste and the flour, and cook until the flour is no longer visible, no more than 1 minute. With the pan off the heat, carefully add the wine. Then return the pan to high heat and stir well, scraping the bottom of the pan with a wooden spoon to release any food bits. Cook for 2 minutes, then stir in the tomatoes and stock, and cook for another minute. Pour into the slow cooker and add the browned meat; stir to combine.
Cover the slow cooker and cook on low until the meat has cooked through and the sauce is aromatic and very flavorful, about 6 hours. Spoon the fat off the surface, stir in the rosemary, break up the meat more with a fork, and season to taste with salt and vinegar.
To serve, toss the sauce with the pasta and garnish with parmesan and a drizzle of olive oil.