Drain the chickpeas and tip them into a bowl. Crack in the eggs. Add the curry powder and breadcrumbs, season with salt and pepper, then mash together using a potato masher or fork until you have a rough paste.
Using your hands, shape the mixture into 8 small burger patties. Heat the oil in a large frying pan over a medium heat and cook the patties for 2-3 minutes on each side. Remove from the pan and drain on a plate lined with kitchen paper.
In the meantime, stone, peel and dice the mango and put it into a small mixing bowl. Thinly slice the spring onion and add it to the bowl. Add the dried mint and chilli flakes and season with salt and pepper.
Preheat the grill to high. Slice the pittas in half and lightly toast them. Serve the burgers with the pittas and salsa.