Clean the mussels. If you buy it with shell, wash it well and add it to 2 cups of water and boil it for 10 minutes. The tight lipped shell will open up after that. Switch off the flame after this and when the water has cool-down, remove the mussels from the shell. You will see a black intestine in the center of the mussel meat. Take this out by pressing the bulged center of the mussel. But here i bought very little sized mussels and I didn't remove that portion.
Now add pickle powder and required salt into cleaned mussels.
Marinate the mussels in the mixture and keep it for 10 minutes.
Heat oil in a kadai and fry the mussels.
Transfer into a plate.
In the same oil, add the chopped ginger, garlic, green chilly and curry leaves.
Fry till the raw smell goes off.
Add the fried mussels into it and 1/4 cups of hot water and salt as required.
Add a piece of jaggery and mix well. Let the pickle cook for 2 minutes on medium to low flame.
Turn off the flame and add vinegar and mix well.
Let it cool and keep it in an airtight container. It can be stored up to 6 months in refrigerator