Bolani: Stuffed Afghan flatbreads

For the dough:

400g plain flour

200ml water

1 tsp salt

2 tbsp olive oil

For the filling:

800g potatoes

2 bunches of spring onions

1 small green pepper

30g fresh coriander

1 tbsp ground coriander

1 small green bell pepper

2 green chillies

1 tsp flaky sea salt

1 tsp ground black pepper