Method

  1. Soften and clean the gundruk

    Softened gundruk lifted from soaking water so grit remains in the bowl

    Put 60 g of dried gundruk in a large bowl and cover it generously with warm water. Let it soften for 10 minutes, then lift the greens out so any grit stays behind. Rinse in two changes of clean water, squeeze firmly, remove any woody stems, and cut the softened greens into rough 2 to 3 cm (3/4 to 1 1/4 in) pieces.

    10:00

  2. Prepare the vegetables

    Peel 570 g of waxy potatoes and cut them into 2.5 cm (1 in) chunks so they cook at the same rate. Chop 170 g of yellow onion and 285 g of ripe tomatoes. Mince 12 g of garlic cloves and 15 g of fresh ginger, then slit 2 green chillies lengthwise. Keep each ingredient close to the stove because the tempering moves quickly.

  3. Temper the fenugreek

    Fenugreek seeds tempered to deep reddish brown in culinary mustard oil

    Heat 30 ml of culinary mustard oil in a heavy pot over medium-high heat until it shimmers but does not smoke. Add 2 g of fenugreek seeds and swirl the pot. Start checking after 20 seconds; the seeds should turn deep reddish brown and smell nutty, not black. If they burn, discard the oil and begin again because scorched fenugreek will make the whole soup harsh.

    00:20

  4. Build the aromatic tomato base

    Thick rusty tomato and onion base with small beads of oil at the edges

    Lower the heat to medium and add 170 g of yellow onion. Cook, stirring often, for 6 to 8 minutes, until soft with golden edges. Add 12 g of garlic cloves, 15 g of fresh ginger, and 2 green chillies, and stir for about 1 minute, until the raw sharpness softens. Add 285 g of ripe tomatoes and 3 g of ground turmeric; cook for 5 to 7 minutes, until the tomatoes collapse into a thick, rusty paste and small beads of oil appear around the edges. Scrape the bottom whenever the mixture begins to catch.

  5. Simmer the soup until the potatoes are tender

    Nepali gundruk and potato soup simmering until the potatoes are tender

    Stir the prepared gundruk into the tomato base until the strands are hot and glossy. Add 570 g of waxy potatoes, 960 ml of hot water, and 6 g of fine salt. Bring to a full boil, then reduce the heat to medium-low and partially cover the pot. Simmer gently for 20 to 25 minutes, starting the timer for the first check at 20 minutes. The potatoes should pierce easily with a knife while still holding their shape. Press a few pieces against the side of the pot and stir them back in to give the broth light body.

    20:00

  6. Finish and serve the soup

    Remove the pot from the heat and let the bubbles settle for 1 minute. The broth should be pourable but lightly thickened, with a clear fermented tang rather than a raw, dusty aroma. Add a little hot water if it is thicker than you like. Scatter with fresh cilantro (optional) and serve hot with steamed rice (optional).

    01:00
Cook's noteGundruk varies in acidity and stemminess. Choose food-grade dried gundruk made from mustard, radish, or cauliflower greens, rinse it thoroughly, and let its aroma mellow in the simmer; the finished broth should still taste distinctly tangy.

Smart Substitutions

  • No mustard oil? Where expressed mustard oil is not labeled for culinary use, use a neutral cooking oil instead. The soup will be milder, but the fermented greens will still provide plenty of character.
  • No fenugreek seeds? Temper cumin seeds instead for a warmer, less bitter base.
  • Different gundruk? Mustard-leaf, radish-leaf, cauliflower-leaf, or mixed gundruk all work; adjust the final seasoning because acidity varies.
  • Prefer less heat? Use one green chilli or omit both; the soup does not depend on chilli for its tang.

Tips and Variations

  • Lift the soaked gundruk out of the bowl instead of pouring everything through a sieve; grit is more likely to remain at the bottom.
  • Watch fenugreek closely. Deep brown seeds taste nutty and pleasantly bitter, while black seeds taste scorched.
  • Crush only a few potato pieces so the broth gains body without losing the contrast of intact chunks and leafy strands.

What Went Wrong?

  • The soup tastes too sharp Crush two or three more potato pieces into the broth and simmer uncovered for a few minutes to round out the acidity.
  • The broth feels gritty The gundruk needed more rinsing. For the next batch, lift it from the soaking water and rinse it in several changes of clean water.
  • The soup tastes bitter The fenugreek probably scorched. Brown it only to deep reddish brown and restart the tempering if the seeds turn black.
  • The potatoes are breaking apart Keep the simmer gentle and use waxy potatoes cut into even chunks; mash only the few pieces needed to thicken the broth.

Nutrition Estimate

Calories280
Protein10 g
Carbs44 g
Fat9 g
  • Fiber: 8 g per serving
  • Sodium: 650 mg per serving

Nutrition disclaimer:This recipe is provided for general cooking information only. Nutrition values are estimates and may vary by ingredients, brands, preparation methods, and serving sizes. Check ingredient labels and follow appropriate food-safety practices. This content is not medical, dietary, allergy, or professional food-safety advice.

gundrukNepalisoupvegetarian

FAQ

What is gundruk?Gundruk is a Nepali ingredient made by fermenting leafy greens such as mustard, radish, or cauliflower leaves and then drying them. It brings a concentrated sour, earthy flavor to soups, stews, and achar.
What should gundruk and potato soup taste like?The broth should be tangy and earthy, with a faint mustard warmth and a gentle bitter-nutty note from fenugreek. Potatoes should soften the acidity without hiding the fermented character.