Sieve the 1 cup Yogurt / Curd so that you have a lump free yogurt mixture and keep it aside.
In a pan add 1 teaspoon Oil.
Once hot add the ½ teaspoon Cumin Seeds and ½ teaspoon Mustard seeds and let it splutter.
Once the seeds are done, add in the 8-10 Curry Leaves and 1-2 Green Chilli.
Add 1/4 teaspoon Turmeric powder
Saute it for 8-10 seconds.
Now add the ½ Cup Bottle Gourd and mix.
Add Salt and let the bottle gourd cook on slow to medium stirring in between.
Cook it until they are slightly done.
I like to cook it until they have a slight crunch and are not too mushy.
Switch off and add yogurt to this.
Mix it and Water to adjust the consistency.
Once done remove the raita in a bowl and serve.
One can enjoy this as is or refrigerate it to cool and enjoy.