Pour the olive oil in a large heavy bottomed pot and set it over medium heat.
Add the pancetta and saute until it starts to give up its fat, about 4-5 minutes.
Add the onions, celery and carrots, season with a generous pinch of salt and cook, while stirring, until translucent, about 8 minutes.
Add the minced garlic and crushed red chili flakes and cook until fragrant, about 1 minute.
Add the tomatoes and chicken stock, then use the back of a wooden spoon to break up the tomatoes a bit.
Drain the beans and add to the pot along with the bay leaf and rosemary sprig.
Bring up to a boil, then reduce to a simmer and cook until the beans have softened, about 2 hours, supplementing with water if it starts to become too thick.
Add the kale, stir, then simmer for about 10 minutes more, or until the kale has fully softened.
Taste, then adjust the seasoning with salt and pepper, then stir in the parsley.
Preheat the oven to 350 degrees F.
Drizzle the sliced bread with olive oil, then arrange it in a single layer on a baking sheet. Bake until golden brown, about 10 minutes.
Remove the bread form the oven and immediately rub the remaining raw clove of garlic on all sides while the bread is still warm.
Place a piece of toasted bread in each bowl, then ladle the soup on top.
Drizzle with olive oil and top with grated parmesan or pecorino Romano.
Serve extra garlic toasts on the side.