
This Bengali classic is pure comfort — tender Yukon Gold potatoes coated in a thick, fragrant paste made from soaked and ground white poppy seeds, with heat from green chilies and a deep savory backbone from mustard oil. The poppy seed paste (posto) is the soul of the dish, turning dense and opaque as it clings to every cube of potato in a way that feels almost luxurious for such a short ingredient list. Mustard oil does double duty here, first bloomed with nigella seeds and a dried red chili to build an aromatic base, then drizzled raw at the finish for a pungent, peppery lift that is completely irreplaceable. Many plant-based dishes lean on coconut milk or coconut cream to achieve that rich, coating texture, but this one gets there entirely through the poppy seed paste and careful low-and-slow cooking — no coconut anything required. The result is earthy, subtly spicy, and satisfying in a way that feels deeply rooted in tradition. It pairs beautifully with steamed rice, and the optional slit green chili on top adds a fresh, fiery flourish that takes the whole plate up a notch.
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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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