Peel and finely dice the onion and garlic. Heat 2 tablespoons of oil in a saucepan and sauté both. Add the tomatoes and chop them in the pot with a wooden spoon. Season with salt, pepper, sugar and vinegar. Bring to the boil, simmer on low heat
Finely crumble the chilli. Mix ricotta with 3 tablespoons of oil, oregano and chilli in a bowl, season with salt and pepper. Put into an ovenproof dish and smooth down. Gratinate under the preheated grill for 4-7 minutes. Cook pasta in boiling salted water according to package instructions
Wash and clean the rocket and pat dry well. Drain the noodles and let them drain. Season sauce again. Mix noodles with sauce and rocket. Arrange on plates. Sprinkle with parmesan and crumbled ricotta. Serve immediately