Heat Oil in a pan or kadai over medium heat. Add Cumin Seeds and Asafoetida. Allow it to crackle.
Once the crackling stops, add Green Chilli and Ginger Garlic Paste. Saute it for few seconds.
Next add Onion Paste and fry it till the onion turns light golden in colour. The onion should be fried till it changes its colour to light brown or else it will remain raw and the taste of Dal will not be good.
Now add the Tomato Paste, mix it and cook till oil starts leaving from the edges of the pan or kadai.
Add the spices such as Turmeric Powder, Red Chilli Powder, Coriander Powder, Garam Masala and Salt.
Mix and cook till the spices are properly cooked. The spices should not remain raw. If needed add small amount of water.
When the spices get cooked properly, add the boiled Moong Dal along with required amount of Water. Mix it.
Simmer the Moong Dal by stirring it on regular intervals over low flame.
After few minutes, the Dal starts thickening. At this point switch off the gas.
Add Chopped Coriander Leaves and mix it with the Dal. Green Moong Dal Tadka is ready to be served.
Serve the Dal by garnishing with Coriander Leaves with your favourite Rice Recipes, Roti, Naan or Paranthas.