Now grease a dhokla box with cooking oil.
Turn on the gas flame and heat 2 glasses of water in a pot or big patila or kadhai.
Keep a utensil stand in it.
Cover the pot with a lid and let the water boil.
Add ¼ tsp baking soda or ENO food salt to the green layer and mix it gently.
Now, in the greased box, pour the green mixture into it.
Keep the greased box in the pot, cover it and let it cook for 5 minutes on high flame.
Meanwhile, add ¼ tsp baking soda to the white mixture and give it a gentle mix.
After 5 minutes, make the gas flame low and take the box out of the pot. Pour the white mixture on the top of the green mixture and spread it evenly.
Keep the dhokla tray back in the pot, turn the gas on flame high, and cover and cook it for 5 minutes.
In the meantime, add ¼ tsp baking soda to the orange mixture and mix well.
Repeat the process of pouring the mixture on top of the other two layers. Spread the mixture evenly as it is the top layer of dhokla.
keep the dhokla tray again in the pot.
Cover it with a lid and let it cook for 10 minutes on a high flame.
After 10 minutes, check if the dhokla is ready or not by poking a toothpick into it. If it comes out clean, that means our dhokla is ready.
Turn off the flame, take the dhokla tray out and let the dhokla cool for about half an hour.