Pasta e fagioli—or 'pasta fazool' in the Neapolitan dialect that Italian-American culture immortalized—is the archetypal cucina povera dish of Campania, a complete meal that combines protein, carbohydrate, and vegetables in a single pot with an economy that sustained generations of Southern Italian families. The Neapolitan version is distinct from Northern Italian interpretations: it uses cannellini or borlotti beans cooked from dried with aromatics, a soffritto of onion, celery, carrot, and garlic, tomato in moderate quantity (San Marzano, naturally), and short tubular pasta like ditalini or tubetti added to cook directly in the bean broth. The transformative technique is passing roughly a third of the cooked beans through a food mill or mashing them, then returning this purée to the pot—it thickens the broth into a creamy base that coats the pasta while whole beans provide textural contrast. A prosciutto bone or pancetta rind simmered in the broth is traditional, contributing collagen and pork depth without requiring expensive cuts. The consistency should be dense—'azzeccata'—neither soup nor sauce, the same starch-on-starch principle that governs pasta e patate. Olive oil is drizzled generously at serving, raw, and black pepper is ground over the top. The dish improves dramatically when reheated the next day, as the starches continue to merge and the flavours deepen. Regional variations are infinite: some add mussels (pasta e fagioli con le cozze), creating a surf-and-turf logic; others use lard instead of olive oil. The beans must never be salted during cooking—salt toughens the skins. It is added only once they're tender.
Cook beans from dried, never salted until tender. Purée one-third of beans to thicken broth. Cook pasta directly in the bean broth. Achieve azzeccata density. Finish with raw olive oil and black pepper. Use pork scraps for depth.
Soak beans overnight with a strip of kombu (or bay leaf) to help soften skins. The soaking liquid is flavourful—use it for cooking. Adding a Parmigiano rind during the bean cooking phase adds glutamic depth. Leftover pasta e fagioli, pan-fried until crusty, becomes a frittata-like cake called 'pasta e fagioli riscaldata.'
Salting beans during cooking (toughens skins). Using canned beans exclusively (lose the starchy broth). Making it too liquid. Cooking pasta separately. Skipping the bean purée step. Using too much tomato.
La Cucina Napoletana — Jeanne Carola Francesconi; Marcella Hazan, Essentials of Classic Italian Cooking