Wash moong dal in lots of water untill all starch goes away from it. Let it soak for 15 mins.
Drain it and put it in a kadai. Add 4 cups of water, turmeric, green chilli, garlic, ginger, curry leaves, coriander leaves, chilli powder and mix well.
Bring this to a boil and let it simmer for 20 – 25 mins untill completely cooked and soft.
Now add tamarind, salt and mix well. Let it simmer for 5 mins.
Make seasoning by heating oil. Add mustard and cumin seeds and let it crackle. Add dry red chilli and curry leaves and mix well.
Pour this seasoning over the dal and mix well.
Garnish with lots of coriander leaves and mix well.