Inji Puli Achar is a special pickles from Kerala, India made basically from chopped or grated Inji (Ginger) and Tamarind (Puli) or Tamarind Paste cooked with lots of spices like any other Achaar/Achar from Kerala. (Please see related article on Achar/Achaar)
Inji Puli Achar is mostly prepared for big and very important festivities, like Onam and Wedding feast. It was one of the Pickles (Achar) prepared during the wedding of one of my second family member in Allepey, a district in Kerala.
Below is a picture of Inji Puli served during the said wedding. Can be seen clearly are Black Mustard Seeds (Kadugu) which is one of the spices used for making Achar/Achaar.