Pizza Base Sauce

Finely chop up a medium onion and saute it in the olive oil in a pan.
Throw in a normal sized can of whole/chopped Italian plum tomatoes and bring it to the boil.
Give the tomatoes and onions a quick stir and add 2 teaspoons of tomato puree, salt/pepper to taste, 1 tablespoon of white wine vinegar (or balsamic vinegar) and 3 teaspoons of sugar to liven the tomatoes up a bit.
Simmer for up to an 30-40 minutes stirring often to break up the tomatoes.
Sieve the sauce back into the pan and add a 1/2 teaspoon of dried oregano and a wee bit of dried basil if you like and simmer for another 10 mins or so until the consistancy is about right.