Put your pressure cooker into saute or browning mode and add the oil. Add the onion and cook for 2 minutes. Stir in the ginger, chilli and garlic and cook for another 3-5 minutes until everything has softened.
Add the spices and cook until fragrant then stir in the aubergines, potatoes and tomatoes until everything is coated in the spices. Pour in the vegetable stock and tomato puree then put the lid on and seal.
Cook for 3 minutes. I used the stew mode on our pressure cooker so use the equivalent on yours. Once it's finished cooking release the steam and serve with rice and chopped coriander.
Nutrition information is an estimate and will vary depending on the exact ingredients used.