Spicy Lamb Bolognese

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2 tablespoons butter

2 tablespoons olive oil, plus more for serving

1 carrot, peeled and finely chopped 

1 stalk celery, finely chopped 

1 onion, finely chopped 

Kosher salt

12 ounces ground beef chuck 

12 ounces ground lamb 

1/4 cup tomato paste 

1 teaspoon Calabrian chili paste 

1/2 teaspoon red pepper flakes 

1 clove garlic, chopped 

1/2 cup whole milk 

1 cup dry red wine, such as Chianti 

1 bay leaf 

One 3-inch Parmesan rind plus 1/3 cup freshly grated Parmesan

One 28-ounce can whole San Marzano tomatoes, crushed by hand 

Creamy Polenta with Spinach, recipe follows, for serving

Creamy Polenta with Spinach:

2 cups low-sodium chicken broth

2 tablespoons olive oil 

2 cloves garlic, smashed and peeled 

3/4 cup quick-cook polenta 

Kosher salt 

1 cup freshly grated Parmesan, plus more for serving

1/2 cup (4 ounces) mascarpone cheese 

1/2 cup freshly grated pecorino cheese 

3 tablespoons unsalted butter 

5 ounces baby spinach, roughly chopped