Fry all the vegetables in a big pan (preferably a wok) in a little oil.
When the vegetables are soft and beginning to go brown, add the two tins of tomatoes,garlic puree,tomato puree and pesto.
cover the sauce and let it simmer for about 20 mins, stirring occasionally, until it reduces down to a thick sauce like consistency. Season to taste. Yum.
This recipe makes shed loads, so my advice is to freeze some :)