Select sauté on the instant pot and adjust to normal.
Add oil to the pot.
When the oil is hot add the mustard seeds and curry leaves.
When the mustard seeds splutter add the onions.
When the onions turn golden in roughly 2 to 4 minutes add the ginger garlic paste. Sauté for a few seconds.
Then add the shrimp, turmeric, red chili powder, water, and salt. Make sure nothing is stuck to the bottom of the pot and scrape the bottom of the pot well.
Press cancel.
Secure the lid on the pot with the pressure-valve sealed.
Select manual and cook at high pressure for 1 minute.
Use quick pressure release to depressurize.
Open the lid.
Select sauté again. Add the crushed spices, and the ingredients under final touch (desiccated coconut and tamarind concentrate).
All the gravy needs to be evaporated. It should take about 2 minutes. Keep stirring and sautéing.
Press cancel when the gravy has dried up.
Transfer in a serving bowl immediately.