Heat 1 tsp of ghee in a large pot. Into this, add cumin seeds and fry for two minutes.
Add chopped onions and saute till brown. Add chopped ginger, split green chillies and fry on a low flame for 5 minutes.
Add turmeric powder and red chili powder. Let it cook till the oil separates from the masala.
Add cubed potatoes, washed rice and washed dal. Saute for 5 minutes. Add a pinch of ajwain powder, green peas, a tsp of sugar and salt to taste.
Also add raw mango, chopped into fine pieces. Mix together and add in 4 cups of water. Bring to a simmer, cover the pot and let it simmer for 20-25 minutes.
Garnish the khichdi with fresh coriander and 2 tbsp of ghee. Serve hot!