Indian cooking
Indian cooking / Dishes / The Rasam
The Rasam (Tamil Nadu Piquant Soup)

The Rasam

Tamil Nadu Piquant Soup
Vegetarian●●●Origin Tamil NaduPrep 15 minutesCook 25 minutes

A sharp, peppery South Indian broth infused with tamarind, tomatoes, and freshly toasted spices. Light and comforting, it balances vibrant acidity with an aromatic, fiery finish.

Spices for the rasam powder

16 gToasted with the dal in step 1
01
3.4 g2 teaspoons
spice
02
6 g1 tablespoon
spice
03
Black peppercorn · Kali Mirchroasted and coarsely ground
6 g2 teaspoons
spice
Keep whole; they will be toasted and ground with the dal.

Ground spices for the broth

3 gAdded to the water and tomatoes in step 2
01
3 g1 teaspoon
spice
Stir directly into the pot with the tamarind and tomatoes.

Tempering spices

8 gFried in hot oil in step 4
01
Dried red chilli · Sukhi Lal Mirchstems removed and wiped with a damp cloth
2 g2 chillies
spice
02
3.3 g1 teaspoon
spice
03
2.1 g1 teaspoon
spice
04
~0.3 gpinch
spice
Keep whole: they go into the hot oil together.

Everything else

01
Pigeon peas · Toor Dalrinsed and drained
26 g2 tablespoons
legume
03
100 g
vegetable
04
12 g4 cloves
aromatic
05
to taste
salt
06
14 g1 tablespoon
oil/fat
07
5 g20 leaves
herb

Method

  1. Warm a heavy skillet over medium-low heat. Add 25.8 g toor dal along with the spices for the rasam powder, toasting gently until fragrant. Tip everything into a mortar or spice grinder and pulse to a coarse powder.
  2. Pour 500 ml water into a large saucepan and add 15.6 g tamarind extract, 100 g tomato, the ground spices for the broth, and salt to taste. Bring to a boil, then reduce the heat to low and simmer uncovered for 8 to 10 minutes, stirring occasionally.
  3. Stir 12 g garlic and the ground dal-spice mixture into the pan. Cover with a lid, raise the heat to medium until the soup comes back to a boil, then turn the heat down to low to keep it simmering.
  4. Warm 13.5 g vegetable oil in a small frying pan over medium heat. Tip in the tempering spices and fry for about 1 minute until the seeds begin popping, then toss in 5 g curry leaf and cook until the crackling subsides.
  5. Pour the hot tempering immediately into the simmering soup, stir well to blend, and take the pan off the heat.

Don't have something?

Toor dal
  • Red lentils

    Use equal weight. Cooks considerably faster and breaks down into a softer, creamier consistency with an earthier taste.

  • Chana dal

    Use equal weight. Requires longer soaking and cooking; remains firmer with a nuttier bite and less starchy thickening.

  • Split mung beans

    Use equal weight. Cooks quickly to a lighter, more delicate, and silky texture.

Coriander seeds
  • Ground coriander

    Use 75% of the weight; stir in along with wet masala or tomato purée rather than frying in hot oil, as the fine powder burns instantly.

  • Cumin seed

    Use 50% of the weight for tempering in hot oil. Lacks the floral, sweet citrus flavour of coriander, introducing warm, pungent earthiness instead.

  • Fennel seed

    Use 50% of the weight in tempering; provides pleasant aromatic sweetness, though noticeably aniseedy rather than citrusy.

Cumin seed
  • Ground cumin

    Use 70% of the weight; add with ground spices or sauce bases rather than hot oil tempering, where it scorches quickly and turns bitter.

  • Black cumin seeds

    Use equal weight for oil tempering. Delivers an earthy profile with an additional musky, smoky, and slightly bitter edge.

  • Fennel seed

    Use 60% of the weight for tempering; offers comparable warm aroma, but leans sweet and liquorice-like rather than savoury and earthy.

Black peppercorn
  • Coarsely ground black pepper

    Use 75% of the weight. Add midway through simmering; spreads heat evenly through the dish instead of delivering isolated bursts.

  • Ground black pepper

    Use 50% of the weight. Stir in near the end of cooking; significantly darkens light gravies and provides an immediate, sharp bite.

Tamarind extract
  • Tamarind

    Use 180% of the weight of compressed tamarind; soak in three times its weight of boiling water for 15 minutes, knead, and strain out the thick pulp.

  • Dried mango powder

    Use 35% of the weight dissolved in two tablespoons of warm water. Provides sharp tang, though the resulting sauce will be lighter in colour.

  • Lemon juice

    Use equal weight, added right at the end of cooking. Adds sharp acidity without the deep brown hue or pulpy thickness.

Tomato
  • Tomato purée

    Use 40% to 50% of the fresh tomato weight mixed with a splash of water. Imparts a deeper red colour, thicker sauce, and slightly sweeter cooked flavour.

  • Plain yogurt

    Use 60% of the weight, whisked smooth and added on low heat. Provides rich body and sourness, though the gravy becomes paler and creamier.

Ground turmeric
  • Ground ginger

    Use 50% of the weight. Mimics turmeric's warm, earthy, rhizome background, but provides none of the golden-yellow colour.

  • Saffron

    Steep a tiny pinch (0.1 g per 2 g turmeric) in 2 tbsp warm water; use to match the rich golden hue. Contributes an aristocratic, honeyed floral flavour rather than earthy bitterness.

Garlic
  • Garlic paste

    Use equal weight. Fry gently in oil or ghee with the ginger; incorporates smoothly into curries without visible minced bits.

  • Garlic powder

    Use 15% to 20% of the weight (about 1 g for every 5 to 6 g fresh cloves). Whisk into sauces; gives a savoury, toasted garlic flavour without raw pungency.

  • Shallot

    Use 1.5 times the weight, very finely minced. Sauté until golden; provides savoury allium sweetness, though it lacks garlic's pungent sulphur bite.

Vegetable oil
  • Peanut oil

    Use 1:1 by weight. Handles high-heat frying identically and introduces a very subtle, pleasant nuttiness.

  • Ghee

    Use 1:1 by weight. Yields a much richer, authentic aroma and a glossy, heavier mouthfeel.

  • Mustard oil

    Use 1:1 by weight. Heat until smoking, then cool slightly before cooking to temper its intensely pungent, sharp mustard kick.

Dried red chilli
  • Dried kashmiri chilli

    Use equal weight whole. Fry in hot oil or ghee as tempered spice; gives a richer red colour with slightly milder heat.

  • Red chilli powder

    Use 50% to 70% of the weight. Stir into the oil with ground spices; distributes heat evenly throughout the dish without whole chilli skins.

Mustard seed
  • Black mustard seed

    Use the same weight. The seeds are smaller and hotter; fry in hot oil until they pop, about 20–30 seconds, and reduce the heat if they darken too fast. The dish will be a little sharper.

  • Yellow mustard seeds

    Use the same weight. They are milder and larger; fry a few seconds longer until they pop. The finished dish will have less pungency.

  • Ground mustard seed

    Use 70% of the weight of whole seed, added with the other ground spices rather than fried whole. You lose the popping texture and the heat comes through more evenly.

Asafoetida
  • Garlic powder

    Use double the weight. Stir into hot oil just before adding wet ingredients; mimics the allium savoury background without the sulphurous edge.

  • Garlic paste

    Use 2 g for every 0.5 g of asafoetida. Sauté in oil until the raw smell clears; adds moisture and sweet allium depth.

Curry leaf
  • Bay leaf

    Fry 1 bay leaf for every 5 curry leaves in hot oil; imparts a warm, woodsy background note, but misses the citrus-sulphury punch entirely.

  • Lime juice

    Add a small squeeze (about 5 ml per sprig of curry leaves) right before serving; provides sharp citrus top notes without the toasty, herbal aroma.

Similar dishes

Pappu Charu
Spicy Tamarind Pepper Water
Pappu Charu tastes significantly more tart and acidic from its large quantity of tamarind, trading the peppery, garlicky warmth of this dish for the sharper heat of fresh green chillies.
  • Same: Pappu Charu shares a base of tamarind and tomatoes tempered with mustard seeds, cumin, dried red chillies, and curry leaves in vegetable oil.
  • Different: It adds fresh onions, green chillies, and coriander leaves, but omits the toor dal, garlic, black peppercorns, and asafoetida used in this dish while relying on far more tamarind extract.
Tamatar Rasam
Tomato Pepper Water
Tamatar Rasam has a sweeter, intensely tomato-forward flavor, lacking the pungent tamarind sourness and sharp black pepper heat of this dish.
  • Same: Both soups share a tomato and garlic base tempered in vegetable oil with mustard seeds, cumin seeds, dried red chillies, curry leaves, turmeric, and asafoetida.
  • Different: Tamatar Rasam uses a much larger quantity of tomatoes alongside onions, sugar, chilli powder, urad dal, and fresh coriander leaves, but omits the tamarind extract, toor dal, whole coriander seeds, and black peppercorns used in this dish.
Andhra Tomato Paappu
Spiced Garlic & Tomato Dal
Andhra Tomato Paappu tastes tangy from tomato and rich from ghee with mild chilli heat, while this dish tastes sharply sour from tamarind and fiery from black pepper and dried red chilli.
  • Same: Andhra Tomato Paappu and this dish both use toor dal, tomato, turmeric, cumin, asafoetida, curry leaf, and garlic.
  • Different: Andhra Tomato Paappu uses 250 g toor dal and ghee with onion, ginger, and green chilli, and lacks tamarind, mustard seed, black peppercorn, coriander seed, and dried red chilli; this dish is a thin rasam with 25.8 g toor dal, tamarind extract, toasted spices, mustard seed, and vegetable oil.
Masoor Pappu Charu
Spicy Pepper Water
Masoor Pappu Charu is richer and sweeter from the ghee and stewed onions with a stronger tamarind punch, rather than having the lighter garlic-and-tomato profile of this dish.
  • Same: Both are South Indian lentil broths soured with tamarind and spiced with black pepper, cumin, coriander seeds, and a mustard-curry leaf tempering.
  • Different: Masoor Pappu Charu uses masoor dal instead of toor dal, incorporates ghee, fresh coriander, and a massive amount of onions, but leaves out the tomatoes and garlic used in this dish.