Take Tamarind remove the seeds blend to corse paste and keep a side.
now blend red chillies corse and mix tamarind past, salt,turmuric,garlic,cumin seeds and blend again do not add any water.
for tempering in a pan add oil, murstard seeds,cumin, uradal,channa dal, garlic, mix will cook till the dal are slight brown colour,add hing,curry leaves.
Now add the tempering to blended pickle