Heat the oil in a large frying pan on medium
To check that the oil is hot put a couple of mustard seeds in , if they pop it's hot enough
Add all the seeds , the chilli powder and tumeric and salt
Fry for a minute or 2 to release those flavours
Add the potatoes
Coat them in the mix and fry for about 5 minutes
Sprinkle on the chilli flakes
Cover and cook for another 5 minutes on a lower heat
Serve