Rasam powder—a South Indian spice blend used to flavour the famous rasam, a chili-hot soup dish made from toovar (arhar) dal lentils. Ingredients vary. The home-made rasam powder recipe contains mustard seeds, coriander seeds, dried hot red chilies, black peppercorns, fenugreek seeds, and cumin seeds. Rasam powder can be purchased ready-mixed in packets or tins from Indian grocery shops.