Slow-Cooker Bolognese

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4 tablespoons olive oil

4 celery stalks, chopped 

2 carrots, chopped 

2 onions, chopped 

Kosher salt and freshly ground black pepper

6 cloves garlic, chopped 

One 6-ounce can tomato paste 

1 cup dry red wine 

4 pounds ground beef 

2 cups whole milk 

Two 28-ounce cans crushed tomatoes 

1 tablespoon dried oregano 

1 tablespoon dried basil 

2 teaspoons dried thyme 

2 teaspoons red pepper flakes 

1/2 teaspoon ground nutmeg 

1 Parmesan rind, optional, plus grated Parmesan, for serving

Cooked spaghetti, for serving

Chopped fresh basil, for serving

Chopped fresh parsley, for serving