Cook the pasta in salted water, ideally al dente. Once cooked, drain it in a colander and set aside. Heat some oil in a pan, and I recommend adding a spoonful of butter as well. When the oil is hot, add finely chopped onion and sauté for about 3 minutes, then add grated garlic, stir, and cook for another minute.
Next, add the grated carrot to the pan, stir it with the onion, and cook everything for about 3 minutes. Then, add canned tomatoes, tomato paste, oregano or Italian herbs, and salt and pepper to taste. Stir everything well and let the sauce simmer on low heat for about 6-8 minutes until it thickens.
Add the drained tuna from the cans, break it up in the pan, and mix it with the sauce. Keep it on the heat for about 2 minutes, then add the cooked pasta and stir well so the sauce coats the pasta evenly.
Finally, sprinkle the grated cheese over the pasta, cover the pan with a lid, and keep it on the heat for 3-4 minutes until the cheese melts. You can top it with fresh parsley. Serve immediately.