Swiped from the BBC.
batch tomatoes (any quantity and any size, from cherry to plum)
olive oil, for brushing and covering
basil or oregano, for topping
Heat oven to 140C/120C fan/gas 1. Halve tomatoes and arrange over a baking sheet, cut-sides up. Brush lightly with olive oil and put a small piece of shredded basil or oregano on each. Sprinkle with seasoning and bake for 2-3 hrs, depending on size, until semi-dried. Pack into jars and pour over olive oil. Use for salads, sauces, pizza and pasta. Store in the fridge for up to a week.