Cook the pasta as directed. Halve the cherry tomatoes and chop the rocket. Peel the onions, dice them finely and fry them in olive oil. Peel the garlic and cut into small pieces. Add to the onions and sauté briefly. Add the crayfish meat and fry briefly. Add the chopped chilli pepper. Then add the halved cherry tomatoes and the rocket into the pan and stir briefly. Pour everything over the pasta and mix well. Serve with freshly grated parmesan.