Soak tamarind in 1/4 cup of hot water for at least 10 minutes or till we grind the chutney
In a heavy-bottomed pan add oil and let the oil turn warm
Add chana dal, urad dal, mustard seeds, and fenugreek seeds and roast in medium flame
After mixing well add red chilli and evenly roast
Once the dal starts changing color add curry leaves and cumin seeds and saute
Cook till the dal turns golden brown
Turn down the flame to low and add chopped ginger and saute for 30 seconds and turn off the flame. Do not fry the ginger too long as it will make it bitter. Let all the ingredients sit in the hot pan until they all cool down to room temperature
After everything is cool transfer the mixture to the blender
Add in 1 tablespoon of jaggery, salt, and 1/2 quantity of tamarind pulp.
Blend to smooth chutney, add remaining tamarind pulp and 1 tablespoon of jaggery and grind again
Further for tempering, heat oil in a tadka pan
Once when oil is hot add in mustard seeds and curry leaves; let them splutter
Finally, transfer the tempering over prepared allam pachadi and serve