II
The Method
1
Set a large, heavy pot over medium heat. Add a film of olive oil and render the diced pork rib meat until golden on all sides. The fat runs freely and the pieces colour without steaming — this is the fat that will enrich the entire broth.
2
Add the onion, celery, carrot, and garlic to the pot. Cook in the rendered pork fat until the soffritto is completely soft and translucent, with no raw edge remaining on the onion.
3
Add the drained borlotti beans, chopped tomato, and rosemary sprigs. Pour over enough cold water to cover the beans by 8 cm. Bring to a simmer and cook, uncovered, for 1½ to 2 hours. The beans must be completely tender and beginning to collapse — press one between thumb and forefinger and it should yield with no resistance whatsoever. Do not proceed until this point is reached; firm beans at this stage will not finish correctly once the pasta is in the pot.
4
Remove the rosemary sprigs. Lift out one-third of the beans with a slotted spoon and pass them through a food mill or press them through a sieve. Return the purée to the pot and stir it through. This step creates the thick, creamy medium that separates this dish from a simple bean soup. Season the broth assertively with salt — it should taste slightly over-seasoned, as the pasta will absorb it. This is where the dish lives or dies: the beans must be fully broken down, a portion puréed, and the seasoning correct before the pasta enters the pot — there is no recovering from under-cooked beans or a flat broth at this stage.
5
Add the raw pasta directly to the bean broth. Cook 8 to 10 minutes, stirring frequently to prevent the starch from catching on the base. Add boiling water, a ladleful at a time, only if needed to keep the pasta moving — the final consistency should be dense and porridge-like, not soupy. The pasta is done when it is just tender and has absorbed the surrounding liquid into a unified mass.
6
Remove the pot from the heat. Allow the dish to rest for 5 minutes — the pasta continues to swell and the consistency thickens visibly during this rest. A spoon stood upright in the pot should tilt slowly rather than fall at once.
7
Ladle into warmed bowls. Finish each portion with a generous pour of raw extra-virgin olive oil. The oil is the last seasoning and is not omitted.