Most cuisines treat flour as a thickener added carefully at the end. Indian cooking's besan gravies invert that: gram flour enters first, roasts in fat, and becomes the flavour itself. Get the sequence right and humble ingredients make complete meals; rush it and raw-flour pastiness ruins everything.
Roasting is the whole game. Besan in hot fat or oil, stirred continuously, must travel from raw to nutty — the colour shifts pale gold toward deep amber and the smell transforms from beany to toasted. This takes longer than instinct expects, often eight to ten minutes of constant attention. Under-roasted besan cannot be rescued later; the rawness persists through hours of simmering.
Then liquid, warm, added gradually while stirring — besan clumps instantly when shocked with cold water. Some traditions pre-mix besan with water or curd into a slurry instead; both routes work, but pick one and stay consistent through the pour.
Sour timing matters more here than other gravies. Curd-based karhis want the curd whisked smooth, room temperature, added off high flame or split curdling results. The gentle sourness needs a long gentle simmer afterward to mellow and integrate — a karhi rushed tastes sharp; one given forty minutes tastes rounded.
Consistency target: coating-the-back-of-spoon loose, since besan keeps drinking liquid as it rests. Finish with the classic tadka poured over hot — red chilli, jeera, maybe methi — because aroma arriving at serving time reads as freshness every single meal.
Golden besan karhi with pakoras in a deep vessel, tadka on top.