Dice the onions and sauté together with the crushed garlic in a pan in olive oil. Add the filling of the sausages (without the intestines), finely mash with a fork and fry. Finely grate the carrots and fry them briefly, then add the tomatoes, season with chilli and oregano and simmer for 15 minutes.
In the meantime, cook the farfalle almost al dente, then let it simmer in the pan with the sauce for another two minutes, season with salt and pepper.