1 kg of vine tomatoes, size doesn't really matter in this case! (Better if you've grown them yourself though!)
Drizzle the whole thing with generous splash of olive oil, and a few spots of balsamic vinegar, season with salt and pepper.
Prepare stock by adding a pint of boiling water to 3 teaspoons of stock and stir.
Once veg has started to brown on top and tomatoes begin to release all their juices, add all this to a large pan. Add the stock, and stir together over a very low heat.