First of all in, a mixing bowl take sooji, water, and curd. Mix well and keep it aside for 20-30 minutes. This is our basic batter, which will be used for creating all three layers.
Divide this batter into three parts for each layer.

In a separate bowl take one part of the basic batter. Combine all ingredients listed under green layer from the above list.
Grease a dhokla plate and heat the dhokla cooker. Pour this green batter into the plate and steam for 10 minutes.

Just before 10 minutes comes to end prepare for the second layer. Mix all the ingredients listed under the white layer. After 10 min pour this white batter over green layer. Steam it for another 10 min.

Finally, prepare for the saffron layer by mixing all ingredients listed under saffron layer. After 10 min pour this batter over this white cooked layer. Steam it for 10 min.

Switch off the flame and rest it for some time. Let it cool down for a few minutes.
After cooling down this dhokla comes out easily from the plate. Prepare for tempering and spread over it.

Serve this tri-color dhokla with green coriander chutney.