Bring a large pan of salted water to the boil and place the courgettes in the pan. Cover and boil until very soft around 10-15 minutes.
Drain and place in a colander. Place a plate over the courgettes with something heavy on top of the plate. Leave to drain for an hour and discard the water. You are trying to squeeze as much water / moisture out of the courgettes as you can.
Take the courgettes and place on a chopping board and chop finely. Place in a mixing bowl and add the garlic, lemon juice, Greek yoghurt, tahini , olive oil and salt. Mix to combine.
Place in a serving bowl. Mix the seeds / nuts with the Aleppo pepper and sumac plus a pinch of sea salt and scatter over the courgette mixture. Roughly chop the parsley leaves and scatter. Drizzle with some more olive oil and serve.