Combine 1 cup water with grated ginger and chopped green chili. Set aside till required.
Sift the gram flour in a bowl. Add salt, turmeric powder, sugar, baking powder and mix nicely.
In small quantity add the ginger water, oil, lemon juice to the sifted flour and stir to combine. Whisk the mixture nicely for next 5 - 10 minutes.
Cover the batter and set aside to rest for 5 - 6 minutes.
Prepare a microwave safe bowl by greasing with a teaspoon of oil. Keep aside.
Add fruit salt or baking soda to the dhokla batter and mix nicely. The batter will rise and turn frothy. Do not whisk the batter for too long, once combined stop whisking.
Pour the batter into the greased microwave-safe bowl and arrange it in a large bowl. Fill 1/4 of the large bowl with water. Cook dhokla in the microwave for 5 minutes.
Insert a toothpick in the center to check the doneness. Once cooked, allow the dhokla to cool down for few minutes before inverting and cutting into pieces.