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Heat oven to 200C/180C fan/gas 6. In a roasting tin, toss the aubergine with the oil and roast for 15 mins, then stir in the tomatoes, garlic, olives and torn basil leaves, and cook for another 10 mins.
Top with the bread and dot with the chunks of mozzarella. Bake for a further 25 mins, then scatter over the remaining basil leaves before serving.