In a kadai add oil then add mustarad seed let them crackle.then add dry red chillies,curry leaves,ginger,green chilli saute it for 2 minutes.then add onion, salt,and turmeric powder,saute it well.when the onion become transperant add 1/4 cup of water,then add 1 carrot grated.then add boiled and smashed potatoes and enough salt to it