How to make it
- 1Dry the curry leaves first
If fresh, microwave curry leaves on low for 2 minutes or air-dry for 24 hours until completely crisp. Wet leaves create moisture in the finished powder.
- 2Roast toor dal until golden
In a dry pan over low heat, roast toor dal separately, stirring constantly, until it turns light golden and smells nutty — about 5 minutes. Transfer and cool. Dal takes longer than spices and burns at a different temperature.
- 3Roast whole spices together
In the same pan, roast peppercorns, coriander seeds, cumin, and dry red chillies for 5–6 minutes on low heat until fragrant. Add dried curry leaves in the last minute. Pepper should turn a shade darker but never smoke.
- 4Cool completely — 12 minutes minimum
Rasam powder has a high proportion of pepper, which retains heat longer than other spices. Cool fully on a wide plate before grinding.
- 5Grind, add powders, and store
Grind roasted spices and dal together to a fine powder. Add turmeric and hing and pulse once more. Sieve and transfer to a sealed jar. Use 1½–2 tsp per serving of rasam.
Rasam powder is unusual in that black pepper — not chilli — is the primary heat source and the defining character of the blend. A good rasam should make you feel warmth from the inside rather than burning on the lips. This is why rasam is traditionally recommended during illness — pepper has genuine digestive and antimicrobial properties.
Where to use rasam powder
- Add 1 tbsp fresh grated coconut (dry-roasted) for a Chettinad-style rasam powder
- Include 1 tsp fennel seeds for a more aromatic, slightly sweet blend
- Double the black pepper for a medicinal, cold-fighting version
- Add 1 tsp dried tamarind powder directly for a more sour character