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Stir for a bit. If it gets sticky, put a little bit of water in, and cover the pot for a while. Make sure you don't scorch it at all.
When the potatoes are about half done, put in the coriander and turmeric. Stir and cover. Put it on a low flame for about 5 minutes. It's done when you can easily cut through a potato piece with the back of a knife.
posted by Michael Balarama