Sambar powder :-

8 tbsp. Coriander seeds
1 tbsp. channa dal
1tbsp. Urad dal
1 tbsp. jeera
1/2 tbsp. methi
1/2 tbsp. pepper corn
10-15. Red chillies
Hing

Method
Dry roast all the ingredients in a pan
After allowing to cool, grind in a mixer

Store in an air tight container.
Interesting fact is coriander seeds Vs all the ingredients mixed is in 2:1 proportion.