
This Bengali classic is pure comfort — golden potato cubes coated in a thick, fragrant paste of white poppy seeds, mustard oil, and green chilies that clings to every piece in the most satisfying way. The technique starts with soaking and grinding the poppy seeds into a dense, opaque paste, which is what gives the dish its signature nutty richness and velvety texture. Mustard oil does double duty here, first blooming the nigella seeds and dried red chili to build a deeply aromatic base, then finishing the dish raw for that unmistakable pungent kick that makes aloo posto so distinctive. Because every ingredient is whole, plant-based, and straightforward, there are no hidden additives or synthetic preservatives to worry about — just real spices, potatoes, and seeds doing exactly what they're supposed to do. The low-and-slow covered cook at the end is where the magic happens, letting the paste thicken and meld into the potatoes until the whole skillet smells like something your grandmother would have made on a Sunday. Serve it with a slit green chili on top for a little extra heat, or keep it mild — either way, this is the kind of dish that makes plain steamed rice feel like a full meal.
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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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