Pour the olive oil into a saucepan and place on a low heat. Peel and finely dice the onion and garlic. Add the onion to the saucepan and cook for 2 minutes, add the garlic and cook for a further minute. Add the tinned tomatoes and seasoning and cook slowly for 45 minutes. The sauce needs to be a thick consistency before using. Chop the basil and add to the reduced sauce.
«Puree the tomatoes or the sauce to get a finer result and to reduce the amount of time needed to reduce the liquid to a thick consistency.»