Sambar powder
Ingredients 
1/2 kg Red chillies
1/2 kg Coriander seeds (dhania)
200gm Thur dal
200gm Chanadal
3 tsp Fenugreek (methi )seeds
1 tsp raw rice
4 pieces turmeric
Dry all the ingredients in hot sun and grind to a fine powder in a mill.
Those who cant find a mill or live abroad, can follow the ratio given below to grind it in a mixer.
50gm chillies
50gm coriander seeds
2 tbs thur dal
2 tbs chana dal
1/4 tsp fenugree
Add turmeric powder after grinding all the ingredients.