Hilsa Poached in Fresh Bengali Mustard Gravy

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An iconic dish from Bangladesh featuring delicate hilsa fish gently poached in a pungent sauce made from freshly ground black and white mustard seeds. The fish's natural richness balances the sharp heat of raw mustard, while a generous pour of smoked mustard oil adds unmistakable depth. Best enjoyed with plain steamed rice that can soak up every drop of the golden, peppery gravy.

Nutrition Facts

Per serving (estimated)

• 410 kcalCalories
• 30 gFat
• 7 gSaturated Fat
• 5 gCarbs
• 2 gFiber
• 1 gSugar
• 30 gProtein
• 640 mgSodium
• 510 mgPotassium
• 190 mgCalcium
• 2 mgIron
• 9 mgVitamin C
• 75 mcgVitamin A

Ingredients

For the fish

• 4 hilsa (ilish) steaks, about 150 g each
• 1 teaspoon turmeric powder
• 1 teaspoon fine sea salt
• 1 tablespoon mustard oil, for brushing
• Lemon wedges, for serving

For the mustard paste

• 3 tablespoons black mustard seeds
• 1 tablespoon white mustard seeds
• 1 small green chili, roughly chopped
• 3 tablespoons water, plus more as needed

For the sauce

• 4 tablespoons mustard oil (sarson tel)
• 1/2 teaspoon nigella seeds (kalonji)
• 4 green chilies, slit lengthwise
• 2 green tomatoes, cut into wedges (optional)
• 1 teaspoon turmeric powder
• 1 cup hot water
• 1 teaspoon salt, or to taste

Directions

1. Soak the black and white mustard seeds together in warm water for 30 minutes, then drain and grind with the small green chili and 3 tablespoons fresh water until you have a smooth, thick paste.
2. Pat the hilsa steaks dry with paper towels, then rub evenly with 1 teaspoon turmeric, 1 teaspoon salt, and a thin brush of mustard oil; set aside to marinate for 15 minutes.
3. Heat the mustard oil in a wide, heavy-bottomed pan over medium-high heat until it begins to smoke and smells nutty, about 2 minutes, then reduce the heat to low.
4. Add the nigella seeds and let them crackle for 10 seconds, then drop in the slit green chilies and stir briefly to release their aroma.
5. Stir in the freshly ground mustard paste and remaining 1 teaspoon turmeric, cooking for just 1 minute until the raw mustard aroma softens; do not brown.
6. Pour in 1 cup hot water, add the green tomatoes and salt, and bring the sauce to a gentle simmer.
7. Carefully slide the marinated hilsa steaks into the sauce in a single layer and spoon a little sauce over each piece, then cover the pan tightly.
8. Poach gently over low heat for 8 to 10 minutes, until the flesh turns opaque and flakes easily with a fork; do not stir or flip the delicate pieces.
9. Remove from the heat, top with one fresh slit green chili for color, and serve immediately with hot steamed rice and lemon wedges.

Cook’s Notes

• Fresh hilsa from Bangladesh is ideal, but quality frozen ilish works well; thaw fully and pat very dry before marinating so the sauce clings.
• Smoke the mustard oil until it just begins to smoke to remove its raw bitterness and unlock the nutty, pungent backbone of the dish.
• Use freshly ground mustard paste for the sharpest heat; pre-made jarred paste loses much of its pungency once it is opened.
• Do not overcook the hilsa; the flesh should be just opaque and flaky, and will continue cooking gently in the residual heat of the sauce.
• Always serve with plain white rice to balance the assertive mustard and rich fish oils.

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