Dry roast the rava till its turns lightly brown and set aside.
Heat oil and add mustard seeds. When it pops add urad dal, asafoetida and red chillies. Fry till the dal turns golden.
Add onions, green chillies, ginger and curry leaves. Fry till onions become soft.
Add salt, water and bring to boil. Then reduce the flame to low and slowly add the roasted rava and mix well, making sure there are no lumps.
Close and cook in low flame for 5 minutes or till all the water is absorbed. Then add ghee, mix well and stir for another 2-3 minutes. Garnish with coriander leaves.
Notes
If you want a bit gooey upma, then add 3 cups of water.
I add tomatoes at times, which gives a tangy taste to the upma. Alternatively, you can squeeze some lemon at the end.
Adding ghee at the end gives a nice flavor to upma.
You can also add in some vegetables like peas, carrots, beans etc after frying the onions.