Take besan, sooji, salt and citric acid in a bowl and mix.
Add ginger and green chilies paste and oil. Again mix properly.
Now make batter by adding little water at a time.
Sprinkle fruit salt on the batter. Sprinkle few drops of water on it and it will start to bubble up.
Immediately stir the batter and pour into prepared thali or pan.
Steam it for 15 minutes on medium heat.
While khaman are steaming, make tadka by Heating the oil in a small pan on medium heat. Once hot add mustard seeds, let them pop. Add sesame seeds, let them splutter.
Add green chilies, fry for a minute. Turn off the heat and let it cool for a minute or two.
Then pour 1/2 cup of water in the tadka and add sugar. Stir it till sugar dissolves.
Pour that tempered water evenly on to fluffy khaman. It will soak all the water and will become moist .