Step 1

Heat the olive oil in a large pot over medium-low heat. Add the pancetta and cook until the fat begins to render, about 5 minutes. Add the onions, carrots and celery and increase the heat to medium; cook, stirring frequently, until the onions become translucent, about 5 minutes. Add the garlic and cook 1 minute more, stirring constantly so the garlic doesn't burn.

Step 2

Add the wine and cook until it has nearly evaporated, about 5 minutes. Add the broth, salt, pepper, beans, lentils, tomatoes, bay leaves, and rosemary. Increase the heat to high and bring to a boil, then reduce the heat to medium-low and simmer, uncovered, until the lentils are just tender, 20 to 30 minutes, depending on the type of lentils you used.

Step 3

Use a ladle to transfer about 1 cup of the beans and veggies and a little liquid to a blender. Remove the center knob so steam can escape. Hold a paper towel or kitchen towel over the opening to prevent splatters. Purée until smooth and set aside.

Step 4

Add the pasta to the pot and stir to incorporate. Turn the heat up to a gentle boil and cook until the pasta is tender but still firm to the bite, 8 to 12 minutes depending on the type of pasta you used (follow timing on the package). The soup will thicken a bit by the time the pasta is cooked. Fish out and discard the bay leaves.

Step 5

Stir the reserved puréed mixture into the soup. (If you're having a hard time getting the mixture out of the blender, remove as much as you can with a rubber spatula, then add some of the hot soup broth to the blender and swirl around to loosen it up; it should come right out.) Cook briefly, until the soup is heated through.

Step 6

Remove the soup from heat and stir in the Parmigiano-Reggiano. If the soup seems too thick, gradually add 1 to 2 cups of water or chicken broth and thin to the desired consistency (the longer the soup sits on the stove, the thicker it will get). Season to taste with salt and pepper. Ladle the soup into bowls and sprinkle with more cheese, if desired. Note that as the finished soup sits on the stove, the pasta and beans will continue to soak up the broth. If it gets too thick, you can thin it with a bit of broth or water.