Heat the rava in a kadhai and dry roast on a medium flame for 4 to 5 minutes, while stirring occasionally. Keep aside.
Heat the olive oil in a kadhai and add the mustard seeds.
When the seeds crackle, add the urad dal, curry leaves and green chillies and sauté on a medium flame for a few seconds.
Add the onions and sauté on a medium flame for 1 to 2 minutes.
Add the roasted rava, 3 cups of hot water and salt and mix well and cover with a lid and cook on a slow flame for 3 to 4 minutes, while stirring occasionally.
Add the lemon juice and sugar, mix well and cook on a medium flame for another 1 minute, while stirring continuously. Serve warm.