1. Cook tagliatelle according to package instructions.
2. Cut the onion into slices and chop the garlic. Fry in a hot pan and season with salt and pepper. Add the Parma ham (which has been cut into wide strips) and the cherry tomatoes. Stir and cook for a minute and then add the cooked pasta.
3. Remove from heat, add the arugula and mix again. Serve the pasta with a sprinkle of grated parmesan cheese on top.