
Bengali home cooking has a way of turning the simplest pantry staples into something deeply satisfying, and this potato dish is a perfect example. The star of the show is posto — white poppy seeds soaked, then ground into a thick, opaque paste with green chilies — which coats every cube of Yukon Gold potato in a nutty, subtly spicy crust that's unlike anything you'd find in a Western kitchen. Mustard oil is heated until it just smokes, which mellows its sharp bite and gives the whole dish that unmistakable Bengali backbone, while nigella seeds and a dried red chili bloom in the oil for a fragrant, crackling base. The potatoes cook low and slow until the paste clings to them in a dense, almost dry layer — no sauce pooling at the bottom, just bold flavor locked onto each piece. A final drizzle of raw mustard oil right before serving adds a peppery lift that makes the whole dish come alive. Because every ingredient here is plant-based by nature, there's no swapping or substituting needed — this is simply how the dish is made, and it's completely satisfying on its own terms. Serve it over steamed rice for a weeknight meal that feels both humble and quietly extraordinary.
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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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