Preheat the oven to 200ºC/400ºF/gas 6. Place the halved tomatoes in an ovenproof dish and roast for 6-8 minutes or until they soften and start to collapse.
Break the ciabatta into small cubes and place in a serving bowl.
Combine the olive oil, lemon juice and basil in a pan and heat gently.
When the tomatoes are cooked, place in the bowl with the bread and toss well until the bread has soaked up the tomato juice as they break up slightly.
Drizzle with the dressing. Season well and toss to combine all the ingredients.