Sarson ka Saag — Mustard Green Slow-Cook (सरसों का साग)

Combine the mustard greens, bathua, and spinach in a large heavy pot and add enough cold water to just cover — approximately 400 ml. Bring to the boil over high heat, then reduce to a steady simmer and cook uncovered for 45 to 60 minutes, so that the prolonged open cooking drives off the volatile compounds that make raw mustard greens sharp and acrid, converting them to the deep, sweet, slightly nutty flavour the dish requires. The volume will reduce by roughly half; taste before moving on — there must be no residual sharpness from the raw mustard, and the greens should be a deep, uniform green throughout.

Remove from the heat and work the cooked greens to a coarse, thick paste with a wooden masher or the back of a ladle — not a smooth purée, so that the finished saag retains the characteristic rough body that holds the tadka rather than absorbing it invisibly. Return the pot to low heat, whisk the makki ka atta with 4 tbsp cold water to a smooth slurry before stirring it in, so the cornmeal disperses evenly and does not form lumps that would leave raw, gritty pockets in the finished dish. Cook, stirring steadily, for a further 8 to 10 minutes until the saag thickens to a body that holds its shape loosely on the spoon and no raw cornmeal taste remains — under-cooked greens cannot be rescued here, and too little cornmeal produces a watery saag that will not carry the tadka.

In a small pan, melt the butter over medium heat, then add the garlic and ginger and cook, stirring, until the garlic is pale gold at the edges and fragrant — about 2 minutes — because pushing beyond pale gold into deep brown will turn the ginger bitter and overwhelm the clean, grassy note of the greens beneath. Remove from the heat and crumble in the kasuri methi, stirring once so the residual heat in the butter blooms the dried fenugreek without scorching it; the tadka is ready when the butter is visibly golden and smells of toasted garlic and dried fenugreek.

Pour the tadka directly over the surface of the saag in its pot without stirring it in fully, so the streaks of golden butter across the green remain visible at table — they signal to the eye what the nose already knows. Taste and adjust salt, then serve immediately with a knob of cold white butter melted over the top of each portion at table, alongside makki ki roti and a piece of jaggery.