Heat the olive oil in large pot, sweat the onions, garlic, carrots, celery, potatoes and carrots until they have softened a little
Add the stock, chilli, and the tomato concentrate. Simmer until the vegetables are soft. Blend until it's smooth.
Add the drained borlotti beans and pasta. Season to taste.
Serve with a drizzle of the oil and some of the chopped rosemary. Add grated parmesan if desired.