Lemon Rice or 'Chitranna' is a common in Southern parts of Karnataka and many parts of South India. It's an item, what you can call a poor man's dish. The ingredients and steps are almost the same as in Avalakki... the only difference is soaked cooked rice replaces soaked Avalakki.
Prepare vaggarni as explained in Avalakki post and mix it to the rice. However, the rice needs to be cooked well in advance so that it's cool and the grains are separate.