Bring a large saucepan of salted water to the boil and cook the pasta according to the time indicated on the packet (in general 10 to 12 minutes).
Peel, quarter and deseed the tomatoes.
Peel and thinly slice the onions.
Heat a little olive oil in a frying pan, add the chillies and the onions. Cook until the onions are soft. Add the tomatoes, a pinch of salt and cook for a further. Add the basil and the cooked pasta.
«Adjust the amount of chilli according to your taste. For a super quick sauce, use tinned chopped tomatoes and add some finely chopped garlic.»