
This Bengali classic is pure comfort — tender Yukon Gold potatoes coated in a thick, fragrant poppy seed paste that clings to every cube in the most satisfying way. The posto paste is the heart of the dish, ground from soaked white poppy seeds and green chilies into something dense, nutty, and deeply aromatic. Mustard oil does double duty here, first bloomed with nigella seeds and dried red chili to build a spiced base, then drizzled raw at the finish to bring that signature sharp, pungent edge that makes Bengali cooking so distinctive. Because the entire dish is built around potatoes, whole spices, and a hand-ground paste, there is nothing hiding in the ingredient list that could sneak in unwanted grains — it is naturally and completely free of rice without any substitutions or workarounds needed. The technique of cooking the paste directly into the potatoes over medium-low heat lets it thicken and dry down into a coating rather than a sauce, which means every bite is intensely flavored rather than watered down. It is a deeply traditional preparation that happens to be both plant-based and grain-free, making it a genuinely exciting option when you want something that feels special without a lot of fuss.
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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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