Cook the pasta in boiling salted water for 11 minutes, then drain them and mix them with a tablespoon of olive oil. Clean all the vegetables. Cut the tomatoes in half, cucumbers - in rings, onion - thin crescents and olives - chop, if large.
Combine the vinegar, mustard, salt, black pepper, sugar, oregano and mix them well with olive oil. Pour the marinade and mix it with the noodles, vegetables and cubes of sheep cheese (maybe mozzarella ).
Allow 30 minutes to flavor before serving. Then add arugula to the salad, stir gently and dispense into plates.