Whip the yogurt and add the milk as needed to make the consistency of pancake batter, set aside.
Heat the oil in a saucepan on medium-high heat.
Add the cumin seeds and asafetida. After the cumin seeds crack, add red chilies. Stir-fry a few seconds.
Add lauki, ginger, green chilies, and cilantro, and stir-fry until most of the water has evaporated and the lauki is tender. This should take about four to five minutes.
After the lauki cools, mix it well into the yogurt.
Add more milk if needed.
For best results, serve chilled.