1. Soak tamarind in hot water for 10 minutes, then filter all the dust particles and make it a paste.
2. Cut onions, tomatoes, garlic and keep other ingredients ready.
3. Fry fenugreek for a minute and make it powdered.
4. Heat oil in kadai, splutter mustard, fry red chillies, curry leaves, black gram dal, bengal gram dal, onions followed by tomatoes, garlic, then add red chiili powder, coriander powder, asafoetida, turmeric powder, and little salt.
5. Pour tamarind paste to this mixture. Mix them well.
6. The content has to boil and come to half. It has to be boiled atleast for 30 minutes.
7. Finally add fenugreek powder and mix it well.
8. Mirchi kuzhambu is hot and delicious.

Courtesy: http://tamilveg.blogspot.com/