Sambar Powder

Coriander Seeds - 9 tbsp 
Chana Dal - 3 tbsp
Tur Dal - 3 tbsp       
Cumin Seeds - 3 tbsp        
Fenugreek (Methi) Seeds - 1 tbsp
Black Peppercorns - 1 tbsp           
Dried Whole Red Chilies - 30
Asafoetida / Hing - 1 heaped tsp
Turmeric - 1 tsp

Dry roast all the above ingredients(except Hing) on slow fire one after another in an iron skillet until they change color and release their aroma.

Cool and grind to a fine powder. Mix with Hing and store in an airtight container.