Place the onion, garlic and the tomatoes in a deep saucepan.
Add the purée, olive oil, oregano and the soft brown sugar.
Bring to the boil, then lower the heat and simmer for 1 hour until thick for a tasty sauce that can be stored in the fridge for 2-3 days.
Cook's tip: Try stirring your tomato sauce through cooked pasta or using it to marinate chicken breasts before cooking. You could also use it as a delicious topping for pizzas or a flavoursome relish for burgers.