Preheat the oven to 200°C fan/220°C/425°F/Gas mark 7.
Pour the olive oil into a large ovenproof dish or roasting tray and heat in the oven for 5–10 minutes. Carefully add the aubergine cubes to the hot oil. Season well with salt and pepper, add the diluted rose harissa and toss everything together. Place the dish or tray in the hot oven, setting the timer for 15 minutes. When the timer sounds and 15 minutes has passed, stir to make sure all sides of the aubergine cubes are roasting. Set the timer again for another 15 minutes.
After a further 15 minutes, remove the tray from the oven and add the cherry tomatoes. Return the tray to the hot oven, this time setting the timer for 20 minutes. When the 20 minute timer sounds, add the drained chickpeas and stir well. Return the tray to the oven and roast for a final 10 minutes.
Remove the tray from the oven, stir in the grated lemon zest and leave to cool for 15 minutes. Check the seasoning and adjust as necessary.
Drizzle with a generous amount of the tahini dressing and scatter over the mint leaves. Toast the flatbreads or pitta breads in a dry frying pan and serve immediately.
Leftovers will keep when covered and stored in the fridge for up to 3 days. To reheat, cover the tray with foil and warm in a 180°C fan/200°C/400°F/Gas mark 6 oven until piping hot.
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