Method

Step 1: -
Blend grated coconut with warm water. Strain and take out the coconut milk.
Add yellow mustard - 2 tsp, black mustard - 1 tsp, poppy seed - 1 tsp and cumin seed - 1 gm. Blend all whole spices with coconut milk. Keep the mixture separately.

Step 2: -
Take the mixture in a bowl. Add oil - 2 tsp, Cumin seed - 1 gm, Salt - to taste, Turmeric powder – ½ tsp and red chili 2 pieces. Mix everything nicely. Add tender coconut water and mix again. Marinade prawn with mixture and rest for 30 mins. Scoop and add tender coconut to give flavor.

Step 3: -
Place prawn inside the tender coconut shell. Topped with green chili, oil and seal to steam.

Step 4: -
Steam the sealed coconut for 45 mins. Check the gravy consistency and doneness of prawn before serving.