-
1
Place the panzetta lardons in a cold, heavy pot and set over a medium flame. Render until the fat runs clear and the lardons are lightly coloured but not crisp. The pot should smell of warm cured pork fat before any vegetable enters it.
-
2
Add the carrot, celery, and leek to the rendered panzetta fat. Cook over a moderate heat, stirring occasionally, until the vegetables have softened and taken on a little colour from the fat — approximately ten minutes. They should yield at the press of a spoon.
-
3
Add the cabbage, potato, tomato, and drained haricot beans. Pour over the water or stock. Bring to a steady simmer and cook, partially covered, until the beans are fully tender and the potato is soft throughout — approximately sixty to ninety minutes, depending on the age of the beans. Press a bean against the side of the pot; it must yield without resistance.
-
4
This is where the dish lives or dies. With ten minutes of cooking time remaining, lay the thick slices of two-day-old bread flat across the surface of the soup. Do not stir, do not press. Allow the bread to absorb the broth, swell, and begin to dissolve into the soup body. At the end of ten minutes the bread should have fully swollen and collapsed into the soup, producing a thick, chunky consistency — neither blended nor clear. If the slices hold their form intact after ten minutes, press them gently under the surface and continue for a further two to three minutes.
-
5
Stir the soup once, breaking any remaining bread mass into the body. Taste and correct for salt. The soup should be dark, earthy, and thick — heavy on the spoon, with visible pieces of vegetable throughout. A watery consistency means the bread was insufficient or the cooking time too short.
-
6
Ladle into warmed bowls. Drizzle two tablespoons of Corsican olive oil over each bowl at the moment of service — not stirred in. The oil should sit as a bright green-gold pool on the dark soup surface, visible and undisturbed when the bowl reaches the table.