Carve tomatoes crosswise, blanch, quench and skin them. Peel onion. Chop tomatoes, onion and pancetta finely. Wash and pluck the marjoram
Heat the oil in a pan. Fry the bacon in it. Add onion and fry until transparent. Add diced tomatoes and marjoram. Simmer everything over low heat for about 10 minutes.
Cook the pasta in plenty of boiling salted water for about 10 minutes until al dente. Grate cheese finely. Drain noodles and mix with the bacon and tomato sauce. Sprinkle with cheese