Pre-heat your oven to 200C / 400F;
Pierce aubergines with a fork and lay them on a tray lined with aluminum foil on the bottom rack of the oven turning every twenty minutes, for one hour and fifteen minutes;
When they are ready, they will appear to be wilted and soft;
Remove from oven and allow to cool;
Scoop out the flesh from the aubergines, discarding the skin.
Set aside;
Place large frying pan on medium-high heat
and add 3 tbsp oil.
Add minced garlic and sauté for 30 seconds, (make sure the garlic does not turn brown). Add roasted cumin powder and stir for another 30 seconds, till fragrant.
Add aubergine flesh, salt, ½ tsp turmeric and green chilies and turn heat to high.
Sauté rigorously for 5 minutes, till you see that all the excess liquid has been absorbed.
Turn heat off and set aside. Allow to cool.
Transfer aubergine to a mixing bowl and stir in yoghurt till fully incorporated. Taste for salt.
Transfer to a serving dish and refrigerate for at least one hour.