15 min (Quick)
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Bring a large pot of salted water to a boil. Cook the rigatoni until just tender. Drain and rinse with cold water. Pat dry with paper towels and transfer to a large bowl.
Add the tomatoes, mozzarella, pesto and Parmesan cheese to the pasta. Toss gently. Taste for seasoning, adding salt and pepper if necessary.
If making ahead and storing in the refrigerator, remove the salad from the fridge at least 30 minutes before serving, if possible.