Marinate washed and drained mussels with a mixture of ginger and garlic pastes, chilly powder, coriander powder, turmeric powder, pepper powder and required salt.
Heat oil in a pan.
Splutter mustard seeds.
Add curry leaves, green chillies and marinated mussels to it and fry in low flame for a few minutes. Place a cover and cook the mussels.
Once the mussels are done, remove the lid and add grated coconut. Stir for 2 more mins until everything is blended well.