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1
Combine the rinsed toor dal and rice in a heavy pot at a 1:2 ratio by weight, then add the prepared vegetables and cover with sufficient water — the two must share a single cooking medium from the first moment so the starch from the rice and the body from the dal bind together rather than cooking as separate things that must be reconciled later. Bring to a vigorous boil over high heat. The pot is ready to proceed when a steady rolling boil is established.
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2
Add the tamarind water and salt, then reduce the heat to a steady simmer and cook, stirring at intervals to prevent the dal from settling and scorching — stirring also helps the mass amalgamate evenly, so no pocket of under-cooked grain survives at the centre. This is where the dish lives or dies: continue cooking — adding small amounts of hot water as needed to maintain a thick, spoonable consistency — until the rice grains, dal, and vegetables lose their individual boundaries and merge into a single unified mass; if individual rice grains and dal pieces remain clearly distinguishable, the preparation has not cooked long enough. The surface should be thick and barely fluid, and the sharp edge of the tamarind smell will have mellowed and settled into the background.
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3
Stir in the bisi bele bath powder and cook for a further few minutes over low heat, stirring continuously so the spices bloom gently into the hot mass rather than sitting in raw pockets that would taste harsh against the finished dish. The preparation will thicken further and deepen in colour. Continue until no raw spice aroma remains.
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4
Remove from heat and pour the ghee over the surface, then fold it through — the ghee loosens the thick mass just enough to spoon freely and carries the fragrance of the spices to the surface in a way that water cannot. Scatter the cashews, roasted in ghee until golden, across the top. Serve immediately and very hot — bisi means hot in Kannada — with papad and raita.