Piaj Posto (Bengali Onion Poppy Seed Recipe)

In Birbhum, Bengal, Posto or poppy seeds is very popular. At my grandmother’s home, lunch always included a dish made with posto. In most homes in my grandparents neighbourhood, a Post Dish was a must for lunch as was a Dal. When in a crunch, the lady of the house would serve Posto Bata. Posto bata, is ground Posto ( Poppy seeds), which was mixed with chopped onions, and green chilies, and some salt salt and Mustard oil. It is delicious eaten as a first course with hot steamed rice. The Dal that is a must with any Posto dish is called, Kalaier Dal / Biulir Dal ( white Urad Dal / Black Gram) . My Grandmother made many vegetable dishes with Posto,like Lau bori diye posto, Aloo Posto, Jhinge aloo Posto, and a really lovley Chochori ( Mixed vegetable dish ) . Piaj posto is one of the simplest recipes my Grandmother taught me to make. Piaj is onion in Bengali, and Posto is Poppy seeds, so it a dish of Onion and Poppy seed paste. It is very easy to make and is a tasty spicy dish. The flavour and taste in this preparation comes from Mustard oil and Green chilies. The green chilies should be the hot spicy variety.

Piaj Posto

Ingredients

  • Onion Sliced 2 cups
  • Posto bata ( poppy seed paste) 1/4 cup ( grind 6 tsp. poppy seeds with 1 green chili)
  • Green chilies slit 6 or less.
  • Salt 3/4 tsp
  • Mustard oil 5 tablespoons

Preparation

**How to make the posto bata or poppy seed paste:

There are 3 ways of making Poppy seed paste or Posto bata

1 Soak 6 teaspoons of poppy seeds in 1/2 cup of water. Soak them for at least 1/2 hour. Then, grind it together with 1 green chilli and a pinch of salt in an electric grinder. The paste should be 1/4 cup. Do not add too much water.

2. First, use a coffee grinder to make a powder of the Posto or Poppy Seeds. Then, soak it in enough water to make 1/4 cup. Do not use the grinder in which you grind coffee beans. In this method you can’t grind the green chilies with the Posto or Poppy seeds.

3. The traditional way, which is using a Flat Stone Grinder called Sheel Bata.

4. Peel and slice the onions.

5. Slit the green chillies

Jump to Recipe

How to make Piaj Posto

Green chilies, posto bata and salt

Peel and slice onions like the photo

Heat 4 tablespoons of the mustard oil in a pan or Kadai, save 1 tablespoon for later.

Add slit green chilies and the sliced onions to it.

Fry the onions till the onions are slightly brown, and they look like this.

Add the Posto, or poppy seed paste, and salt. Keep stirring to mix it in well for about 3 to 4 minutes.

Sprinkle the 1 tablespoon mustard oil you had saved.

Switch off the flame and transfer it to a serving dish.

A delicious serving of Piaj Posto, a Bengali dish made with onions and poppy seed paste, garnished with green chilies.

Piaj Posto (Bengali Onion Poppy Seed Recipe)

Piaj Posto is a simple Bengali dish made with onions cooked in poppy seed paste. In Bengali, “piaj” means onion and “posto” means poppy seeds. This is an easy and tasty dish, full of flavour from mustard oil and green chilies, and is perfect with hot steamed rice.
Prep Time 30 minutes
Cook Time 15 minutes
Total Time 45 minutes
Servings: 4 persons
Course: Main Course
Cuisine: Bengali , Indian, vegetarian

Ingredients
  

  • 2 cups sliced onions
  • 1/4 cups Posto bata. ( ground poppy seeds ) 6 tsps. poppy seeds with 1 green chilli
  • 6 pieces Green chillies Slit the chillies
  • 3/4 tsp. Salt
  • 3 Tablespoons Mustard Oil

Equipment

  • 1 Grinder/ coffee grinder
  • 1 Wok or Pan

Method
 

  1. Peel and slice the onions to make 2 cups
  2. Slit the Green chillies
  3. Make the Poppy seeds into a paste. Look at * how to make Posto Bata or Poppy seed Paste above.
  4. Heat the wok/ pan and add the Mustard Oil ( save 1 tsp for garnish )
  5. Add 1 Green chilli
  6. Add the sliced onions and fry, till soft and golden brown.
  7. Add the Poppy seed paste/ posto bata, salt, and the other slit green chillies
  8. Stir well, let it cook with the onions
  9. Taste the salt in the dish before switching off the heat
  10. Transfer the Piaj Posto to a serving dish
  11. Sprinkle the saved 1 tsp of Mustard oil over the Piaj posto
  12. Serve warm with hot steamed rice.

Notes

Adjust the chillies according to your taste
Do not Fry the onions crispy
Mustard oil gives it the distinctive flavour

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Rita's Recipes

Hello, I’m Rita, the home cook behind Rita’s Recipes — a food blog where I share traditional Bengali and Indian recipes alongside family-favourite breads, cakes, and cookies. I grew up in a Bengali household where cooking was part of everyday life. Many of the dishes I share are authentic home-style recipes — light fish curries, seasonal vegetable dishes, lentils, and classic Indian comfort food that have been passed down through generations. At the same time, baking has always been part of our family table. Here you will also find simple homemade breads, soft cakes, and cookies that are easy to make with everyday ingredients. My goal is to preserve traditional flavours while making recipes clear, practical, and accessible for cooks around the world — whether you are new to Indian cuisine or looking for reliable home-style cooking. Thank you for visiting, and I hope my recipes bring warmth to your kitchen.

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