Mah Tenga Sour Dal

Method

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   About Mah Tenga Sour Dal: Mah Tenga applies the tenga (sour) concept to lentils — Assamese cuisine's tradition of using sourness as a primary flavour. The result is a tangy, bright dal that works perfectly in Assam's hot and humid summers when heavy spiced food can feel oppressive. The lemon and tomato lift the dal into a refreshing, almost soup-like dish that pairs beautifully with plain rice.

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   Choose your lentils: Use 1 cup of either yellow moong dal or split red lentils (masoor dal). Both work well — moong gives a slightly more delicate flavour, masoor is heartier. The recipe technique is identical for both.

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   Wash thoroughly: Wash the lentils in 4-5 changes of cold water until the water runs clear. Removing the surface starch prevents foamy boiling.

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   No soaking needed: Both moong and masoor cook fast without soaking. Drain after washing.

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   Prepare the tomatoes: Take 2 medium ripe tomatoes. Chop into small 1cm dice. Slightly over-ripe tomatoes work even better — they break down faster and provide more natural acidity.

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   Prepare the green chillies: Take 2 fresh green chillies. Slit lengthwise. The chillies provide gentle heat that balances the sourness.

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   Cook the dal: Place the washed lentils in a heavy pot. Add 3 cups water and 1 tsp turmeric powder. Bring to a boil over medium-high heat.

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   Skim the foam: As the dal comes to a boil, white foam will rise. Skim and discard.

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   Reduce and simmer: Reduce heat to medium-low. Simmer uncovered for 18-20 minutes for moong, or 15-17 minutes for masoor, stirring every 5 minutes. The dal should be fully soft, with most lentils broken down into a creamy mass.

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    Mash gently: Use the back of a wooden spoon to lightly mash the dal — keep some texture. Do not pure smooth.

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    Adjust consistency: The dal should be slightly thinner than usual — like thick soup, more pourable than typical dals. Mah Tenga is a thinner-style dal. If too thick, add 1/2 cup water; if too thin, simmer 2-3 more minutes.

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    Keep the dal warm: Reduce heat to lowest while you prepare the tempering.

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    Heat the mustard oil: Pour 1 tbsp mustard oil into a small pan or kadhai over medium-high heat. Heat for 30-45 seconds until just smoking, to remove the raw bitter edge.

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    Add the chopped tomatoes: Reduce heat to medium. Add the chopped tomatoes to the smoking-hot oil. They will hiss dramatically. Stir well to coat.

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    Cook the tomatoes thoroughly: Cook the tomatoes on medium heat for 6-8 minutes, stirring every 90 seconds, until they have completely broken down into a thick pulpy mass and oil starts to separate at the edges. This deep cooking is essential — undercooked tomatoes produce a watery dal.

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    Combine with the dal: Pour the cooked tomato masala into the warm dal pot. Stir well to combine. The dal will turn from yellow to a beautiful warm orange-pink colour.

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    Add green chillies: Add the slit green chillies to the dal. Stir.

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    Add salt: Add salt to taste — about 3/4 tsp. Stir.

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    Simmer to marry: Bring back to a gentle simmer. Simmer uncovered for 8 minutes, stirring every 2 minutes. The flavours meld together and the colour deepens slightly.

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    The critical lemon timing: This is the most important step. Switch off the heat completely. Take the pot off the burner. Squeeze in the juice of 1 fresh lemon (about 2 tbsp). Adding lemon juice off-heat keeps the bright fresh aroma; boiling lemon juice turns it bitter.

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    Fold in the lemon: Stir gently to distribute the lemon throughout the dal. The dal will brighten in flavour immediately.

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    Final taste: Dip a clean spoon and taste. The dal should hit you with multiple flavours simultaneously — earthy lentils, deeply savoury cooked tomato, bright fresh lemon, gentle chilli warmth. The sourness should be present but not overwhelming. Adjust by adding more lemon (for brighter sour) or 1/4 tsp sugar (for balanced sourness).

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    Garnish and serve: Sprinkle 2 tbsp finely chopped fresh coriander over the top. Serve hot over plain steamed rice — the most traditional Assamese pairing.

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    The summer cooling effect: Mah Tenga is specifically a summer dal — the sourness from the lemon and tomato has cooling properties in Ayurvedic terms. Drinking the thinner version of this dal alone (like a soup) is even believed to help with heat exhaustion in Assamese folk medicine.

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    Serving suggestions: Pair with simple grains like plain rice or steamed millet. The bright dal also works alongside more substantial dishes like fish curry — the sourness cuts through the richness beautifully. Some Assamese homes also serve a small side of pickle and a piece of papad for crunch.

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    Variations: For a more substantial version, add 1/2 cup chopped greens (spinach, methi) along with the tomatoes — produces a vegetable-rich version. For a richer flavour, add 1/4 cup tamarind water instead of lemon juice — produces a deeper, more umami-tangy version.

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    Leftover storage: Stored in the fridge in an airtight container, this dal keeps for 2-3 days. The lemon flavour fades overnight; refresh by adding a small squeeze of fresh lemon when reheating. Reheat gently with a splash of water on the stovetop.