Source: Jeff Thompson's Open Recipes
Heat 3–4 tablespoons of oil or ghee in a heavy-bottomed frying pan over medium-high heat. The ghee should shimmer and move freely — test by tilting the pan. Once it reaches around 180°C (just before smoking), add the black mustard seeds and cumin seeds together. They'll pop and crackle within 10–15 seconds; this popping is tempering, where dry heat blooms the volatile compounds and transfers them into the fat. Listen for the sound to ease slightly and catch the first whiff of nutty, toasted aromatics — that's your cue to move fast. Add the crushed dried chillies immediately. Stir constantly for 5 seconds. If you stall here, the spices burn and turn bitter.
Tip in all the long beans at once and toss hard for 2 minutes, coating every piece in the seasoned oil. The beans should hiss and char slightly at the edges — this is stir-frying technique working properly, and it builds flavour through the Maillard reaction. The oil temperature will drop; let it recover for 30 seconds before stirring again. Add the ground coriander, salt, and sugar, then stir again. The coriander releases deeper, earthier notes when it hits hot oil rather than cold water — timing matters.
From here, stir-fry for 4–5 minutes total, but watch the beans, not the clock. You want them to turn from bright green to a dull, slightly wrinkled sage-green, and a fork should meet light resistance, not snap through. Some crispness at the edges is correct; a completely soft bean tells you they've begun to lose their flavour-carrying structure. The salt draws moisture from the beans via osmosis, which concentrates their sweetness and lets the spices grip harder.
Taste before plating. The finished dish should taste of toasted cumin and mustard seed with heat that arrives at the back of the throat, not in the front — that's the chilli working in the right register. Serve warm, not piping hot; the spices fade when they cool slightly, and you'll taste them more clearly at room temperature.
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