
This classic Bengali potato dish is deeply satisfying in the most unassuming way — tender Yukon Gold cubes coated in a thick, nutty poppy seed paste with just enough heat from green chilies and a dried red chili to keep things interesting. Every ingredient here is exactly what it says it is: whole poppy seeds soaked and ground fresh, mustard oil, nigella seeds, turmeric, and potatoes. There are no flavor packets, no seasoning blends with hidden additives, and no shortcuts that sneak in synthetic ingredients through the back door. Mustard oil does a lot of the heavy lifting, giving the dish its characteristic pungency and depth — it's heated until it loses its raw edge, then used again as a finishing drizzle for a rounded, aromatic result. The posto paste itself is made entirely from scratch in a spice grinder, so you know exactly what's going into it. It's the kind of dish that tastes like it took far more effort than it did, and it pairs beautifully with steamed rice for a simple, grounding 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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