Step 1: Cut the carrot, onion, garlic, apio rod and chicken breast into small pieces.
Step 2: In a big pan, cook the vegetables and chicken breast for a few minutes.
Step 3: Add the tomato paste, water, salt, pepper and thyme to the pan and let it cook for 2-3 hours on low heat without a lid.
Step 4: Mix and add water when necessary.
Step 5: Boil the pasta as said on the package, strain and add them to the ragù sauce.
Step 6: Serve the pasta in a plate and top with shaved parmesan and dried thyme.