cook cauliflower separately for 1 minute in microwave. cook cauliflower, potato, beans in water and when almost half done add salt and turmeric and keep aside.
In a wok or kadai, pour oil,add ginger garlic and green chilli paste then add onions
when translucent add the tomatoes and fry until tomatoes are completely smashed and oil comes out. then add the coriander powder, pepper powder, turmeric salt and fry well.
pour the vegetable mix and cauliflower, green and red capsicum and pineapple into this masala and add 1/2 water and salt and cook for another 2 minutes