Take a Pressure cooker add 1 or 2 tbsp oil. After oil get heated add onion chopped after few minutes onion change colour add beans, potatoes and tomatoes sauté for 2-3 minutes.

After pressure will release open the lid and add coriander leaves and mix it well. (if little water will left u can switch on the flame and get dissolved all water if u want other wise u can serve like that only.)