In a microwave safe bowl, micro for 10 mins with thrice its amount of water. Then gently mash the dal with a masher or back of a ladle.
Take the chopped onions, cumin seeds, finely chopped green chilies, chopped garlic in the microwave bowl along with 1 tsp of oil. Micro for 3 mins.
Then add the turmeric and salt to the onions. Micro for 1 min.
Remove the bowl outside, add the mashed dal along with 1 cup of water. Mix everything well.
Microwave for 4 -5 mins, until you see the dal thick.