Paalu- anapakaya (Bottle gourd curry)

In the dish I have shown, I have added water and red chili powder in addition to the ingredients I have listed below. So the picture is not indicative of the actual recipe. I prefer all my curries to be spicy and hot. So most of my pictures would be red in colour. But I have modified the ingredients so that they are not too spicy.
Preparation time: 45 min.
Working time: 20 min.
Ingredients:
Bottle gourd: 1 medium (peeled and cut into small cubes)
Onion: 1 medium ( finely chop)
Green chilies: 3-4
Milk: 1/3 cup
Cilantro for garnishing
Salt to taste
Oil: 1 tsp
Seasoning:
Turmeric: 1/4 tsp
Ginger-garlic paste: 1/2 tsp
Cumin seeds: 1/2 tsp
Mustard seeds: 1/2 tsp
Coriander powder: 1 tsp
Curry leaves: 4-5
Method:
Heat oil in a pan/ pressure cooker.
Add Mustard, cumin, curry leaves i the same order.
After 1 min, add onions and green chilies.
When onions turn golden brown, add ginger-garlic paste. Cook until the raw smell is gone.
Add bottle gourd. Cover with the lid.
Cook until the bottle gourd pieces become soft.
If it is pressure cooker, cook until 2 whistles.
When the pressure is gone, open the lid.
Add coriander powder, milk and cook for 2 min.
Add salt and turmeric.
Cook until the milk is absorbed.
Garnish with cilantro and serve with hot rice/ roti.