Wash and soak the sago for about 1 to 2 hours. Drain the excess water and keep it aside.
Boil potato, remove the skin and cut into bite size bits. Put a teaspoon of oil in a kadai and add jeera. When jeera fried well, add potato pieces and stir fry for few minutes. Remove and keep aside.
Chop onion, green chillies finely. Cut carrot into small pieces and cook for just few minutes and remove.
Crush the ground nut coarsely.
In a kadai put the oil and when it is hot, add mustard. When it pops up add urad dhal and fry till it become light brown. Then add chopped onion, green chillies, curry leaves and fry till onion turns transparent. Add carrot and soaked sago, along with turmeric powder, salt and mix well. Close with lid and allow to cook in medium flame for few minutes. Remove the lid and once again mix everything well. Then add stir fried potato pieces and mix it. Sprinkle peanut powder and lemon juice and stir well and remove. Garnish with chopped coriander leaves.
Note: You can add more vegetables like cabbage, cauliflower, mushroom, capsicum, green peas to make it more healthy and tasty.