Put the oil in a frying pan and fry the chopped onion and garlic for about four minutes. Peel and chop the tomatoes and add them to the onion and garlic (if you haven't got any fresh tomatoes, you can use tinned)
With the edge of a spatula mash the tomatoes, onion and garlic up as they cook, for about 15 minutes on a moderate heat. When the mixture is cooked, take off the heat and liquidize so that you are left with a thick tomato sauce.
Chop some leaves of basil, and add this together with the salt and sugar.
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