Soak the shrimps in warm water for about 30 minutes, it will soften
Rinse the shrimps a couple of times and discard the ones that looks black. That confirms it wasn't deveined and I prefer not to use them. Drain the water and set aside
Heat the oil in a pot, on medium heat. Add the cumin seeds. Once it splutters add the shrimps
Fry the shrimps for about a minute to release the flavour
Add the onion, chillies and curry leaf and fry until the onion is translucent
Add the turmeric and the calabash. Season with salt. Mix well. Cover and allow it to cook on a low heat for about 45 minutes or until the calabash is soft and tender
The calabash releases a lot of moisture so no need to add water. In the last few minutes of cooking time, turn up the heat, remove the lid and allow any extra liquid to dry up before turning off the heat
Notes
I used two young calabash that weighed 1.1kg
You can use a potato peeler to peel the calabash or alternatively you can slice them into rings and peel each ring. It is easier that way. Cut them into small cubes
You can adjust the amount of chillies, the chillies I used was hot and if you prefer a milder curry reduce the chillies to two