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Classic Tomato Sauce
1 tablespoons olive oil
1 onion, finely chopped
400 gram (14 ounce) tin chopped tomatoes
2 tablespoons tomato puree
1 teaspoon sugar
Heat the oil in a large pan and fry the onion until soft. Add the remaining ingredients and bring to the boil.
Cover and simmer for 10–15 minutes.