Grate the parmesan. Halve the tomatoes. Cut the garlic and onions into cubes. Cut the chicken breast into strips.
Cook the pasta in salted water according to the instructions on the packet.
Fry the onions and garlic with the chicken breast in a deep pan in olive oil. Then add the cream and the parmesan, stir and simmer on a low temperature.
Season to taste with the lemon juice, salt and pepper.
Put the cooked pasta in the sauce and stir well, then add the rocket and cherry tomatoes and serve immediately.