
Bengali aloo posto is one of those deeply comforting dishes that proves simple ingredients can produce something truly extraordinary. Yukon Gold potatoes are coated in a thick, nutty white poppy seed paste and cooked low and slow until every cube is tender and cloaked in that signature dense, opaque crust. The mustard oil does serious heavy lifting here — heated until it just smokes, it mellows into something rich and slightly pungent that forms the aromatic backbone of the whole dish. Nigella seeds and a dried red chili bloom in the oil first, adding a subtle heat and earthiness before the potatoes ever hit the pan. Because the ingredient list is built entirely around whole spices, seeds, oil, and potatoes, there's nothing to flag or swap out — no hidden rhizomes, no sneaky additions, just clean, plant-based cooking from start to finish. A final drizzle of raw mustard oil right before serving lifts everything with a bright, sharp finish that makes the dish taste alive. Serve it over steamed rice for a weeknight meal that feels like a proper occasion.
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Place the white poppy seeds in a small bowl, cover with cold water, and soak for 30 minutes. Drain well.
Transfer the drained poppy seeds to a spice grinder or blender along with the 2 roughly chopped green chilies, 1/4 tsp salt, and 3 tbsp water. Grind to a smooth, thick paste, scraping down the sides as needed and adding water 1 tsp at a time only if the blades stall. The paste should be dense and opaque, not watery.
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