Put the drained chickpeas with a generous pinch of salt, a spring of rosemary ,2 bay leaves , bacon if using and the 2 litres of water in a pot and boil rapidly for 15 minutes and then gently for 2 hours and 45 minutes. Drain and discard the bacon and the bay leaves.
Chop the rosemary as thinly as possible; I’m afraid the food processor just won’t do it so you’ll have to do it by hand.
Puree the garlic the onion and the carrot in a small food processor, then fry them in a little olive oil over a medium heath until they are soft, add the rosemary and half a glass of white wine and stir gently for one minute.
Now add the chopped tomatoes and the remaining wine and let cook, stirring frequently for about 15 minutes.
Remove about 3 ladleful of chickpeas and puree them with a little water in a food processor.
Add the puree and the chickpeas to the pot with the tomato sauce and cook for about 5 minutes, then add the pasta and cook until very al dente, stirring frequently.
Let it rest for 5 minutes then add the oilive oil.