Aloo Posto Bihar

Method

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   About Aloo Posto: Aloo Posto is the beloved poppy seed potato dish shared between Bihar and Bengal — and probably one of the most comforting dishes in either cuisine. White poppy seeds are soaked, ground to a smooth paste, and used as both a creamy sauce and a thickener with potatoes. The result is a mild, nutty, deeply soothing dish unlike anything else in Indian cooking.

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   Understand white poppy seeds: Use 4 tbsp white poppy seeds (khus khus or posto, sold at every Indian grocery). They are tiny, pale cream-coloured, and have no narcotic properties — they are a culinary ingredient, not the same as the opium poppy. Pre-cooking renders them harmless.

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   Wash the poppy seeds: Place the poppy seeds in a small fine-mesh sieve. Rinse under cold water for 10 seconds — this removes any dust. Drain.

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   Soak the poppy seeds: Place the rinsed poppy seeds in a small bowl with 1/2 cup warm water. Let soak for 30-45 minutes. Soaking softens them so they grind smoothly. Without soaking, they stay grainy and the dish will have a sandy texture.

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   Prepare the potatoes: Take 4 medium potatoes. Peel and cut into 2cm cubes. Drop into cold water as you go to prevent browning. The cubes should be uniform — uneven sizes cook unevenly.

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   Prepare the green chillies: Take 2 fresh green chillies. Slit lengthwise. For posto-style cooking, the chilli is meant to be visible and flavourful but not overwhelming, so you can deseed them for a milder result.

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   Grind the poppy seed paste: Drain the soaked poppy seeds. Place in a small grinder or wet stone (sil-batta) with 1 of the green chillies (the other is for the cooking). Add 2 tbsp cold water. Grind for 2-3 minutes — long grinding is essential for a truly smooth paste. The paste should look like thick white-cream cake batter, with no visible seed grains.

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   The smoothness test: Rub a tiny drop between your thumb and finger. It should feel completely smooth, not sandy. If gritty, grind 1 more minute with 1 tsp more water.

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   Drain the potatoes: Just before cooking, drain the potatoes and pat dry on a kitchen towel. Wet potatoes splatter dangerously in mustard oil.

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    Heat the mustard oil correctly: Pour 1 tsp mustard oil into a heavy-bottomed pan or kadhai over medium-high heat. The amount is small because Aloo Posto is a delicate, lightly-oiled dish. Heat for about 30 seconds until the oil just begins to smoke and the harsh raw smell mellows.

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    Reduce heat: Reduce heat to medium-low. The poppy paste burns easily on high heat — this is one of the most common mistakes. Keep the heat gentle throughout.

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    Add turmeric to the oil: Sprinkle 1/2 tsp turmeric into the warm oil. Stir for 5 seconds.

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    Add the poppy paste: Pour in the ground poppy seed paste. Stir constantly for 2 minutes on low heat. The paste will gradually turn from creamy white to a pale tan as it cooks. Do not let it brown or scorch.

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    Add the potatoes: Tip the dried potato cubes into the paste. Stir gently to coat every cube in the creamy poppy mixture. Add the second slit green chilli.

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    Add water: Pour in 1/2 cup hot water and salt to taste — about 3/4 tsp. Stir to combine. The mixture should be a thick creamy gravy with the potatoes nestled in it.

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    Cover and cook: Reduce heat to low. Cover the pan with a tight-fitting lid. Cook for 15-18 minutes, lifting the lid every 5 minutes for a gentle stir and to add 2 tbsp more water if it dries out completely. The potatoes are done when a fork goes through them with no resistance.

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    Uncover and check: Once tender, remove the lid. The gravy should have thickened to coat the potatoes — a creamy pale yellow paste clinging to each cube. If too thin, simmer uncovered for 2 minutes; if too thick, add 2 tbsp hot water.

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    Final seasoning: Taste a piece. The dish should taste mildly creamy, faintly nutty, gently spicy from the chilli, with the potato providing the soft starchy base. Add a pinch more salt if needed.

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    Finish with raw mustard oil (optional): Some Bihari versions drizzle 1/2 tsp raw mustard oil over the dish at the very end, as a final aromatic touch. This is traditional and excellent if you enjoy the sharp mustard oil note.

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    Serve with steamed rice: Aloo Posto absolutely demands plain steamed rice — the creamy posto sauce mixed into hot rice is the entire experience. Do not serve with rotis; the dish is too delicate to compete with bread. Eat within 1 hour of cooking; the texture is at its best when fresh.