Preheat the oven to 150°C. Set a large casserole pan over a low heat.
Finely chop the onions and garlic. For best results grate them.
Add a splash of oil to the casserole and add the grated onions and garlic. Stir often to stop them sticking and catching.
After a couple of minutes add the herbs, and then a minute later roughly chop the fresh tomatoes and add them to the pan, including the vine stems.
Continue to stew for 6 or 7 minutes and taste, ensuring the onions and tomatoes are sweet. Add the tinned tomatoes and raise the heat, bringing to a fast simmer. Add a cartouche of baking paper, cover with a lid and transfer to the oven for an hour.
After an hour pass the sauce through a sieve or colander set over a bowl and push through until dry. Discard the pulp and season to taste. Use the sauce for pasta or whatever you want.
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Notes
This sauce is delicious as it is, but also incredibly versatile. Use it in a lasgane, bulk it out with vegetables, use it as a base for bolognese, chilli or a rogan josh.