Cook the tortellini according to the instructions on the packet. Chop the onion + garlic, mix the pesto with 4 tablespoons of water; Put on the salad.
Cut parmesan cheese into wafer-thin slices, sprinkle with herbs and parmesan, mix, season to taste and let rest for 1 hour.
With dark balsamic vinegar, the salad doesn`t look really appetizing - but despite the dark vinegar it was an absolute hit at every party and not so fat with mayo and Co.