Tomato Sauce
3 tablespoons unsalted butter
1/2 medium yellow onion, chopped
1 medium fennel bulb, trimmed and chopped
3 garlic cloves, finely chopped
4 teaspoons chopped fresh oregano
1/4 teaspoon red pepper flakes
Salt
1 small carrot, peeled and shredded
One 28-ounce can whole San Marzano tomatoes or plum tomatoes
Freshly ground pepper

2 cups drained, cooked borlotti beans
1/3 cup chopped fresh flat-leaf parsley

Polenta
4 cups water
1 teaspoon salt
1 cup polenta
2 tablespoons unsalted butter
1/2 cup freshly grated Parmesan cheese, plus more for garnishing
Freshly ground pepper