At first remove the skin and head of the prawn and wash it.

Now soak black and white mustard seed, poppy seed in some water for a few minutes.

Take the mustard and poppy seeds in a mixer put green chilli, grated coconut, salt and sugar and make a smooth paste.

Put the prawn in a box mix them well with the paste and mustard oil.

Now in a pan add 6 - 7 cup of water and let it boil. The box with tight lid is put in the boiling water.

After 20 - 25 minutes it is cooked.