
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, made by soaking and grinding white poppy seeds with green chilies into a dense, opaque mixture that turns silky and rich as it cooks down around the potatoes. Mustard oil does the heavy lifting here, bringing a pungent, slightly smoky depth that is completely authentic to the Bengali pantry, while nigella seeds and a dried red chili bloom in the hot oil to build a savory, aromatic base. Because the ingredient list is so focused — potatoes, poppy seeds, a handful of spices — there is nothing hidden to worry about, and the whole dish is naturally plant-based without any substitutions required. The finishing drizzle of raw mustard oil right before serving is a small step that makes a noticeable difference, adding a sharp, grassy note that lifts the whole plate. It is the kind of dish that tastes deeply intentional, like someone's grandmother perfected it over decades, even though the technique is straightforward enough for a weeknight.
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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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