Firstly, dry roast 1 cup bombay rava on low flame for 2-3 minutes. keep aside to cool completely.
now in a large kadai heat 2 tbsp oil and add 1 tsp mustard, ½ tsp urad dal, 1 dried red chilli and few curry leaves. also add jeera for more flavour.
now saute till the mustard seeds splutter.
add in ½ onion and saute well.

Also saute 2 green chilli and 1 inch ginger.
now pour 3 cups water and get to vigorous boil.
further add ½ tsp sugar, ½ tsp salt and 1 tsp ghee. mix well.
keeping the flame on low start adding roasted rava slowly, stirring continuously in another hand.

This helps to prevent from any lumps formation.
now mix continuously till the rava absorbs water.
cover and simmer on low flame for 5 minutes or till upma is cooked well.
furthermore add ½ lemon juice and 2 tbsp coriander leaves. mix well.
finally, serve rava upma / uppittu with coconut chutney or plain.