Place the gram flour in a shallow bowl. Slice the okra pieces lengthwise into quarters and toss them in the gram flour.
Pour the oil into a large saucepan to a depth of approximately 2.5cm/1in and heat until a breadcrumb will sizzle gently when placed into the oil. Add the okra to the pan and fry until the okra is crisp and golden-brown, stirring occasionally.
Remove the okra with a slotted spoon and place it into a large bowl lined with kitchen roll. Sprinkle over the chaat masala, salt, chilli and dried mango powder and toss well. Serve hot.