Kallumakkaya or kadukka or kakka in someplace are shellfish called Mussel.
Clean the Kallumakkaya properly and take the flush from shell.
For taking, flush, first boil the kallumakaaya in water for 5 minutes. Once it is cooled it will open the shell, then you can easily take the flush using knife.
In a bowl add cleaned kallumakaaya pieces, 1/2 tbs of salt, 1 tbs red chili powder, 1/2 tbs turmeric powder, 1/2 tbs pepper powder and 1 tbs of cornflour into it. Marinate with ingredients and keep aside for at least 10 minutes.
Then Deep fry the kallumakaaya in oil .
In this oil add some curry leaves fry it and serve with kallumakaya fry.