Wash sago pearls and add 1 cup water in 1 cup sago pearls. Soak it for 1 hour, sago pearls will get puffy.
Coarsely grind peanuts.
Add oil in microwave safe bowl and microwave for 1 minute on highest temperature. Take out the bowl and add cumin seeds into it. Place back the bowl and microwave for 1 minute on maximum temperature. After suating cumin seeds take out the bowl and add ginger, green chilly and potatoes. Mix all ingredients and microwave for 3 minutes. Take out the bowl, stir potatoes and check whether they have got tender or not. Now add soaked sago pearls, red chilly powder, peanuts and mix al ingredients really well.
Add ¼ cup water as well. Place back the bowl and microwave for 3 minutes. Take out the bowl and stir with help of a spoon. Add green coriander and lemon juice in the khichdi. Cover the bowl and keep is as it is for 5 minutes as standing time. Food is still cooking in the bowl.
Sabudana khichdi is ready. Serve piping hot sabudana khichdi and enjoy eating.
If you are making sabudana khichdi for vrat then add Saindha salt instead of plain salt.