Zucchini and cucumber mor kuzhambu

I love mor kuzhambu. In india they usually make it with  vegetables which have more water content like white pumpkin, chayote squash, bottle gourd and snake gourd. Attimes they make it with ladies finger.
Ingredients:
Zucchini- 2 nos
Cucumber- 1 no
Onions- 1 no ( chopped)
Turmeric- 1/2 tsp.

To grind:

Green chillies-4 -5 nos
Coconut (ground)- 1/4
Cumin seeds- 2-3 tsps.

For tempering:
Coconut oil -1 tbsp
Cumin seeds-1 tsp
Mustard seeds- 1 tsp.
Curry leaves- a sprig.

Method:
  In a hot pan, add oil, curry leaves, mustard seeds, cumin seeds, onions, salt, zucchini, cucumber, turmeric and saute for a while. Add  little water ,salt allow the vegetables to half cook. When they  are half done,  add the ground paste of coconut, cumin seeds and green chillies. Allow them to simmer for a while. Once the vegetables are cooked , turn off the stove and allow to cool. Add buttermilk to it. Serve with hot rice.