At first cut all the vegetables into cubes

Boil the arbi and potatoes

Now coat the veges with salt,chilli and turmeric powder

Make a paste of the mustard seed and mix it with curd.keep aside for firmentation

Add oil in a pan add the coated veges and fry

Cover it for while so that the veges get tender

Now add the mixture of curd and mustard,mix pdoperly