Ribollita Tuscan Twice Boiled Soup

In a large heavy-bottomed pot or Dutch oven, heat the olive oil over medium heat. Add the diced pancetta and cook until crispy, about 5 minutes. Remove the pancetta with a slotted spoon and set aside, leaving the rendered fat in the pot. Add the chopped onion, carrot, and celery to the pot and cook until softened, about 8-10 minutes. Stir in the minced garlic and cook for another minute until fragrant.

Add the crushed tomatoes to the pot and cook for 5 minutes, stirring occasionally. Next, add the drained and rinsed cannellini beans, black cabbage, and Swiss chard or spinach. Stir well to combine all the vegetables.

Pour in the vegetable broth. Bring the mixture to a boil, then reduce the heat to low, cover, and let it simmer for at least 20 minutes, or until the vegetables are tender. Season with salt and black pepper to taste.

Traditionally, Ribollita uses stale bread to thicken the soup. Add the stale Tuscan bread pieces directly into the simmering soup, pushing them down to submerge. Continue to simmer for another 5-10 minutes, allowing the bread to absorb the liquid and thicken the soup. The soup should become very thick and hearty.

Remove the pot from the heat. At this stage, some traditional recipes suggest letting the soup rest for a few hours or even overnight in a cool place. This allows the flavors to meld and the bread to fully integrate. If you are in a hurry, you can proceed to the next step after a short rest of 15-20 minutes.

Before serving, reheat the soup gently over medium-low heat until it comes to a gentle boil again. This is the 'ribollita' or 'twice-boiled' step, which gives the soup its name and further develops its characteristic texture and flavor. Stir occasionally to prevent sticking.

Ladle the hot Ribollita into bowls. Drizzle generously with fresh extra virgin olive oil, sprinkle with the reserved crispy pancetta if using, and garnish with fresh chopped parsley. Serve immediately, perhaps with an additional slice of crusty bread on the side for dipping.