Prepare Upma Filling: Heat a pan over medium-low heat and dry roast the rava for 3-4 minutes until fragrant. Set aside. In the same pan, heat 2 tbsp of ghee, add mustard seeds, urad dal, and chana dal, and sauté until golden. Add curry leaves, 1 chopped green chili, 0.5 inch grated ginger, and hing; sauté for 30 seconds. Add 1 finely chopped onion and cook until translucent. Pour in 1.5 cups of water with 0.5 tsp salt and bring to a boil. Reduce heat, then slowly add the roasted rava while stirring continuously to prevent lumps. Cover and cook on low for 5-6 minutes until fluffy.