Wash the ridge gourd and slightly peel the skin at the ridges as shown.
Cut into thin slices and keep aside.
Add oil in a cooking vessel and when hot add the whole spices. Stir for about 10 seconds.
Add onions and cook for about 8 to 10 mins until soft, transparent and light golden in colour.
Add ginger and garlic paste. Saute for about 2 mins.
Add tomatoes.
Now add turmeric powder and chilli powder.
Mix well and saute for about 5 mins on medium to low flame with the lid closed. A few tablespoons of water can be added to avoid burning. Keep stirring occasionally to prevent it from sticking to the bottom of the pan.
Add 1/2 cup of water and cook for about 10 mins on a medium flame with the lid closed until all the water has been absorbed.
We have a basic onion and tomato curry base when the oil starts to separate.
Add ridge gourd and 1/2 cup of water.
Cook for about 20 mins on a medium flame with the lid closed until the ridge gourd is cooked well and becomes soft.
The ridge gourd curry is ready when the oil starts to separate.
Add prawns.
Add salt. Mix well and cook for 5 mins on medium heat or high heat.
Mix and simmer for about 10 to 12 mins with the lid closed until you get the consistency you desire.
Oil starts to separate from the ridge gourd and prawns masala. Switch off.
Serve it with chapathi, roti, naan or plain rice. I specially like it with dal/rasam and plain rice. Here, I have served this with lemon rice.