Assam Lentil Soup

Method

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   About Assam Lentil Soup: This is the lighter, soupier evening dinner choice in Assamese homes — moong dal cooked thin, tempered with mustard oil and dried red chillies, and seasoned simply. It is calming after heavier afternoon meals, easy to digest, and is often given to recovering invalids. The Assamese version is distinct from Bihari masoor dal — it is plainer, with no garlic or onion, letting the dal's own gentle flavour come through.

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   Choose yellow moong dal: Use 1 cup of yellow moong dal — split mung beans without skin. They are small, pale yellow and split. They cook to soft mush within 20 minutes — perfect for a soup-style preparation.

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   Wash the dal thoroughly: Wash the dal in 4-5 changes of cold water until the water runs nearly clear. Removing the surface starch prevents the soup from going gluey or foamy.

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   No soaking needed: Unlike heavier dals, split moong cooks fast and needs no soaking. Drain after washing.

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   Use the right pot: Use a stainless steel or non-stick pot. Wider is better than taller for soup — wide pots cool slightly which helps even cooking.

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   Cook the dal in plenty of water: Place the washed moong dal in a heavy pot. Add 4 cups water — the higher water-to-dal ratio is what gives this preparation its soup-like consistency. Add 1 tsp turmeric powder. Bring to a boil over high heat.

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   Skim the foam: As the dal comes to a boil, white foam will rise to the surface. Skim it off with a spoon and discard — this foam contains compounds that can cause digestive discomfort, and removing it keeps the soup clean and bright in flavour.

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   Simmer until soft: Once skimmed, reduce heat to medium-low. Simmer uncovered for 18-20 minutes, stirring every 5 minutes. The dal will gradually break down — the lentils first soften, then start to lose their shape, finally turning into a soft creamy mass. The colour will deepen from pale yellow to a warm pale yellow-orange.

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   The texture choice: Once the dal is soft, you have two choices — keep it slightly chunky for a more textured soup, or blend partially smooth.

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    Blend briefly for body: Use an immersion blender directly in the pot, or transfer half the dal to a regular blender. Blend for just 5-10 seconds — you want the soup smooth enough to drink with body, but with some texture remaining. Over-blending makes it gummy.

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    Adjust the consistency: The soup should be thin and pourable, not thick like a regular dal. If too thick, add 1/2 cup hot water; if too thin, simmer 2-3 more minutes uncovered. Aim for a consistency like clear chicken broth, with the dal floating evenly through it.

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    Keep dal warm: Reduce heat to the lowest setting just to keep the soup warm while you make the tempering. The tempering happens fast — have everything ready.

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    Prepare the dried chillies: Take 2 dried red chillies. Snap each in half with your fingers. Tap out and discard most of the seeds for milder heat, or leave them in for sharper heat.

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    Heat the mustard oil correctly: This is the defining step. Pour 1 tbsp mustard oil into a small tempering pan over medium-high heat. Heat for 30-45 seconds until the oil just begins to smoke and the harsh raw smell mellows. This step is essential — raw mustard oil tastes harsh and sharp.

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    Temper with the chillies: Reduce heat to medium. Add the broken dried red chillies. They will sizzle and turn a darker red within 10-15 seconds. Do not let them blacken; burnt chillies taste acrid.

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    Pour over the soup: Switch off the heat. Immediately pour the entire sizzling tempering — oil, chillies and all — over the dal in the pot. The soup will hiss dramatically and fill the kitchen with the aroma of mustard oil and roasted chilli. Do not stir for 30 seconds — let everyone admire the visual splash.

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    Finish and season: Stir gently to combine the tempering through the soup. Simmer for 3-5 more minutes on low heat — this allows the chilli oil to infuse the entire soup. Add salt to taste — about 3/4 tsp. Taste and adjust.

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    Garnish and serve: Switch off the heat. Sprinkle 2 tbsp finely chopped fresh coriander over the top. Ladle into bowls. Serve hot, alongside steamed rice (the most traditional pairing — pour soup directly over rice and eat with a spoon), or as a light first course before a heartier meal. Many Assamese households add a squeeze of lemon juice just before drinking, which brightens the flavour beautifully.