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Red lentil, carrot and cumin soup

A thick red lentil soup with carrot, cumin and lemon.

By The foodose editorial team. Nutrition calculated from USDA FoodData Central. Checked on paper on 20 September 2026; not yet cooked in a test kitchen or photographed, so the times and yield are estimates. How we develop our recipes
What still needs a real kitchen
  • Confirm red lentils collapse in 22 to 28 minutes
  • Photograph the finished bowl
Time
About 45 min
estimated
Serves
2
see below
Energy
535 kcal
per serving
Protein
27 g
per serving
Jump to recipe
Not yet photographed. The panel names the dish’s main ingredients rather than showing a picture we have not taken.

Ingredients for 2 servings

2 servings

Check off ingredients as you go.

No regulated allergens in the ingredients as listed. Check the labels on packaged ingredients:

  • vegetable stock. Vegetable stock often contains celery, and some contain milk or gluten; check the label, especially if you need it vegan.

Cooking steps

  1. Rinse the lentils until the water runs clear.

  2. Soften the diced onion and carrot in the oil over medium-low heat for 10 minutes.

  3. Add the cumin and cook for 30 seconds, then add the lentils and the stock.

  4. Simmer for 22 to 28 minutes, until the lentils have collapsed and the carrot is completely soft.

  5. Blend until smooth, then stir in the lemon juice off the heat and finish with the coriander.

The useful detail

The lemon goes in after blending, off the heat. Acid added at the start of a long simmer cooks away to nothing, and this soup tastes flat and sweet without it.

Make it work for you

One serving is A deep bowl, half the pot. You can switch to a smaller portion in the ingredients above; it is three quarters of this, and it contains correspondingly less energy and protein. It is an option, not a goal.

  • Sweet potato instead of carrot

    Sweeter and thicker.

    Per serving: about 70 kcal more, about 1 g more protein, about the same fat.

  • Leave it unblended

    Chunkier and more like a stew. Cook the carrot smaller if you do.

  • Chicken stock instead of vegetable

    Rounder and more savoury. It stops the soup being vegan.

    Per serving: about 5 kcal more, about 2 g more protein, about 1 g more fat.

Estimated nutrition

Per standard serving, calculated from the ingredients above. Nutrition changes with substitutions, brands and how much oil stays in the pan.

A blended soup that still carries real protein, which most blended soups do not, because the lentils are the body of it rather than a thickener.

Nutrition per serving
Energy535 kcal
Protein27 g
Fat10 g
of which saturates2 g
Carbohydrate89 g
of which sugarsnot calculated
Fibre16 g
Sodium1,570 mg
Show calculation notes

Each ingredient’s weight is multiplied by its USDA FoodData Central values per 100 g. The whole recipe is added up and divided by 2. Raw weights are used for meat, fish and vegetables; beans and lentils are drained weights. All of the oil is counted as eaten. Added salt is not included; sodium from stock, bread, cheese and tinned food is.

Calculation, whole recipe
IngredientWeight usedSourceEnergyProtein
onion120 gFDC 170000Onions, raw48 kcal1.3 g
carrot300 gFDC 170393Carrots, raw123 kcal2.8 g
olive oil14 gFDC 171413Oil, olive, salad or cooking121 kcal0.0 g
ground cumin2 gFDC 170923Spices, cumin seedFoodData Central records cumin seed; ground cumin is the same seed, milled.8 kcal0.4 g
red lentils200 gFDC 174284Lentils, pink or red, raw716 kcal47.8 g
vegetable stock980 gFDC 171583Soup, vegetable broth, ready to serve49 kcal2.4 g
lemon juice31 gFDC 167747Lemon juice, raw7 kcal0.1 g
fresh coriander10 gFDC 169997Coriander (cilantro) leaves, raw2 kcal0.2 g
Whole recipeDivided by 21074 kcal55.0 g

Per serving the energy is rounded to the nearest 5 kcal, grams to the nearest whole gram and sodium to the nearest 10 mg. of which sugars could not be calculated, because one ingredient’s record does not cover it; the row above says which. Calculation method 1.0, September 2026. How the calculation works.

Storage and reheating

In the fridge
Cool it quickly, cover and refrigerate within 2 hours. The FDA chart gives soups and stews 3 to 4 days. It thickens considerably overnight; loosen it with water or stock.
In the freezer
The same chart gives soups and stews 2 to 3 months in the freezer for best quality.
Reheating
Reheat until it reaches 74°C / 165°F, steaming hot throughout, stirring so it heats evenly.

Checked against US Food and Drug Administration, Refrigerator and Freezer Storage Chart, USDA Food Safety and Inspection Service, Leftovers and Food Safety, FoodSafety.gov, Safe Minimum Internal Temperatures and FoodSafety.gov, Cold Food Storage Chart. UK guidance from the Food Standards Agency is shorter, at two days for most leftovers.

Try another recipe

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    A warm chicken soup with soft leeks, carrots and pearl barley.

    About 55 min · 405 kcal · 36 g protein per serving

  • Butternut, white bean and sage soup

    Roasted squash and white beans blended into a smooth sage soup.

    About 50 min · 345 kcal · 20 g protein per serving

    Vegetarian

Where this fits