Rinse the beans and set them aside.
Roughly chop the onion and the carrot. Put them into a food processor, blender, mixer, whatever you have to chop them very finely.
Finely chop the onion and the carrot.
This is what you should get.
Remove the casing of the sausage.
Chop the sausage using a large cooks knife.
Put the olive oil into a sauce pan and heat it over medium heat.
When the oil is hot, add the onion/carrot mix.
Sweat the onion/carrot mix for 3-4 minutes.
Then, add the sausage into the pan. When you add the sausage into the pan, try to break it further, using your fingers, so that it falls into the pan in as many small pieces as possible.
Stir with a wooden spoon and at the same time use the spoon to break the sausage down in small pieces in case you still have some big lumps. Cook for about 8-10 minutes, regularly stirring. If you think that the sausage starts sticking to the bottom of the pan or is getting burnt, then you can decrease the heat or go to the next step immediately.
Add one third of the white wine (50 ml - approx. 3 tablespoons) into the pan and let cook for another 3-4 minutes, regularly stirring.
Then, add the tomato purée and stir to evenly spread it in the sauce.
Turn the heat to low and cover with a lid, leaving one side of the lid slightly open. We need to cook the sauce for about 40 minutes, so it is important that you stir every now and then, and that you check that the sauce does not stick to the bottom of the pan or get too dry or burnt.
If the sauce gets too dry, add a bit of the white wine you have left (I would say another 50 ml - approx. 3 tablespoons), cover with the lid (as shown in the previous picture) and keep cooking. Do not pour all the wine you have, because the sauce would become to liquid; just keep some of the wine for later, in case the sauce gets too dry; you may end up using it for the sauce or drink it.
10 minutes before you reach the 40 minutes cooking time, check the seasoning. Add salt according to taste.
Then, season with black pepper.
Complete the 40 minutes cooking time, leaving one side of the lid slightly open.
After the 40 minutes have passed, you can now add the Borlotti beans into the pan.
Give it a good stir and cook without lid for about 10-15. This way we will bring the sauce to the right consistency, not too liquid, not too dry.
Meanwhile, boil the pasta according to the instructions given on the packet. Remember to cook the pasta “al dente” and to use 10 g (1/3 ounce) salt for each litre (4 1/8 cups) of boiling water.
When the pasta is ready, drain it and put it back into the big pan you have used to boil it. Add the sauce into the pan.
Give it a good stir.
Serve with a generous sprinkle of freshly grated Parmesan cheese. A good glass of bodied red wine is the ideal accompaniment to this dish.