Mix onions, coconut, salt, sugar, and lime juice in a bowl. Keep it aside.
Heat oil in a pan over medium heat.
When the oil is hot, add asafetida, curry leaves, and green chilies and let them crackle for 4-5 seconds.
Add turmeric powder to the pan and saute for 6-8 seconds.
Pour the tempering over the onion coconut mixture and mix well.
Add diet poha chivda to the bowl and mix well.
Serve immediately.
Video
Notes
In case diet chivda is not available, you can air fry or bake the regular poha until nice and crispy and use in this bhel. Any variety of poha can be used to make chivda.