Slit the okra lengthways but keep them joined at the stem.
Put the yoghurt in a bowl, add the chilli powder, garam masala and 1 teaspoon chopped green chillies. Season with salt and mix together.
Add the okra to the yoghurt mixture and set aside for about 20 minutes to soak.
Heat the oil in a heavy-based pan over medium heat, add the ginger and garlic pastes, turmeric and the remaining green chillies and stir-fry for 1-2 minutes.
Now add the okra and yoghurt mixture and cook for a further 5 minutes. Add the ghee and sprinkle over a little garam masala, then reduce the heat to low, cover and cook for about 10 minutes.
Remove the lid and continue cooking for about 5 minutes, or until the yoghurt mixture coats the okra.