Rasam powder is the spice mixture that is used to make South Indian speciality or comfort food Rasam which is basically tomato tamarind soup.
In a pan heat the oil and dry roast the red chillies until they turn dark in colour. Once roasted transfer to a plate and let cool completely.
In the same pan roast coriander seeds until aromatic and dark in colour. Transfer to the plate to cool completely.
Next roast in the peppercorns until it starts popping.Transfer to the plate to cool completely.
After that roast cumin seeds until it turns brown. Transfer to the plate to cool completely.
Finally roast the toor dal until brown in colour. Transfer to the plate to cool completely.
Once everything is roasted and cooled transfer to the mixer and grind coarsely.
If you wish you can add turmeric powder once it is grinded. Mix and your Rasam powder is all ready.
Transfer the rasam powder to a clean dry air tight container. It stays good for 3-4 months. Use 2 tsp of it as and when needed.