Sambar is a South Indian accompaniment served with various south Indian dishes Dosa and Uthappam, Medu Vada, Idali. It is made of Toovar Dal (Pigeon peas), various vegetables, Tamarind pulp and Sambhar Spice blend. Sambar spice blend can be made from scratch or it can be bought from Indian grocery stores.
This recipe video shows you how to make Sambar from Sambar Powder mix. Also see Recipe video for Sambar from Scratch.