My favourite home made one starts with those oil soaked sundried tomatoes and peppers, heated with chopped onion, garlic, oregano and some good quality tomatoe puree. Once the onions have softened, but before they start to brown, add a tin of chopped tomatoes, some onion salt and italian herb mix and then cook for about 20 minutes until the sauce has reduced about 25% (it's a judgement thing but basically you're looking for the chopped tomatoes to have completely broken up and the sauce to be almost a paste-like consistancy)