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Tomato, lentil and celery soup with thyme

A thick red lentil soup with tomato, celery and thyme.

By The foodose editorial team. Nutrition calculated from USDA FoodData Central. Checked on paper on 22 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 rinsed red lentils collapse in 22 to 28 minutes
  • Photograph the finished bowl
Time
About 55 min
estimated
Serves
2
see below
Energy
505 kcal
per serving
Protein
26 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.

Contains celery. Check the labels on packaged ingredients:

  • chopped tomatoes. Tinned tomatoes vary in added salt; the sodium figure uses a standard salted tin.
  • 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 red lentils in a sieve until the water runs clear.

  2. Dice the onion, celery and carrot small and soften them all together in the oil over medium-low heat for 10 to 12 minutes. This slow start is where the sweetness comes from.

  3. Add the thyme leaves and cook for a further minute.

  4. Add the rinsed lentils, the tomatoes and the stock. Bring to the boil, then simmer, partly covered, for 22 to 28 minutes, until the lentils have collapsed.

  5. Blend about half the pan and stir it back in, so the soup is thick but still has something in it.

The useful detail

Blend only half the pan. A lentil soup blended completely smooth loses the body that makes it filling, and on a small appetite that texture is doing real work.

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.

  • 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.

  • Fennel instead of celery

    Sweeter with an aniseed note, and it softens a little faster.

    Per serving: about 15 kcal more, about 1 g more protein, about the same fat.

  • Dried oregano instead of thyme

    More resinous. Use a quarter as much.

    Per serving: about the same energy, about the same protein, about the same 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 soup where the lentils are the body rather than a thickener, which is why a blended vegetable soup here still carries real protein.

Nutrition per serving
Energy505 kcal
Protein26 g
Fat10 g
of which saturates2 g
Carbohydrate83 g
of which sugarsnot calculated
Fibre18 g
Sodium1,530 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
celery200 gFDC 169988Celery, raw28 kcal1.4 g
carrot150 gFDC 170393Carrots, raw62 kcal1.4 g
olive oil14 gFDC 171413Oil, olive, salad or cooking121 kcal0.0 g
fresh thyme leaves1 gFDC 173470Thyme, freshA teaspoon of thyme leaves weighs 0.8 g, under 1 kcal on FoodData Central 173470. That record has no sugars value, so the leaves are listed here rather than counted, which keeps the recipe's sugars calculable.··
red lentils180 gFDC 174284Lentils, pink or red, raw644 kcal43.0 g
chopped tomatoes400 gFDC 170051Tomatoes, red, ripe, canned, packed in tomato juice64 kcal3.2 g
vegetable stock785 gFDC 171583Soup, vegetable broth, ready to serve39 kcal1.9 g
Whole recipeDivided by 21006 kcal52.2 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. Ingredients marked “Not calculated” are excluded and could add at most 1 kcal to the whole recipe. 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 to a paste overnight; loosen it with stock or water.
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