Cook the pasta in 2-3 l boiling salted water (1 teaspoon salt per litre) according to the instructions on the packet. In the meantime, for the vinaigrette, mix vinegar, salt, pepper and 1 teaspoon sugar. Fold in 4 tablespoons of oil. Drain the pasta, rinse and mix with half the vinaigrette. Leave to cool.
Clean, wash and roughly dice the peppers. Heat 2 tablespoons of oil in a frying pan. Fry the bell peppers for 3-4 minutes while turning them. Season with salt and pepper, take out and let cool down.
Drain the mozzarella balls in a sieve. Sort the arugula, wash and drain well. Wash basil, shake dry, pluck off leaves and cut finely.
Mix the pasta, peppers, mozzarella, rocket and basil with the pesto and the rest of the vinaigrette. Serve the salad.