Take all the ingredients and keep it ready.
Grind coconut with shallots,cumin seed and with little water to make a smooth paste.
Clean the mussels and add chilly powder,turmeric powder,salt and water as required.
Heat oil in a clay pot,splutter mustard seed and fenugreek seed init then add chopped shallots,when it turns to golden brown in colour add tomato,green chilly,raw mango and saute for another 4-5 minutes.
Add kallumakkaya along with masala and enough water.
cover the top and cook for 15 minutes.
Add coconut paste and mix well,add water if required to get the currect consistency of curry.
Remove from the flame when it starts boil.
Serve it with rice or chappathi.