Pressure cook the shelled aurekal with 1 cup water and 1 tablespoon oil for 1 whistle on high, then simmer for 5 minutes.
Dry roast the Bombay rava in a pan on low heat until the raw smell disappears. Keep aside.
Finely cut the green chillies and ginger.
In a kadai, heat 5 tablespoons oil. Add mustard seeds and let them splutter.
Add curry leaves, jeera, hing, kadle bele and udina bele. Fry until the dals turn golden.
Add diced ginger and green chillies. Sauté for a minute.
Add turmeric and the cooked aurekal along with its cooking water.
Add 1.5 cups more water and bring to a rolling boil. Add fresh coriander and salt.
Slowly add the roasted rava while stirring continuously to avoid lumps.
Cover and simmer on low heat for 3–4 minutes.
Add ghee on top and mix well. Finish with fresh lemon juice.
Serve piping hot.