Red Lentil Soup with Potato, Carrot and Celery
A vegetable-broth soup with red lentils, potatoes, carrots, celery and thyme.
The source’s red-lentil soup uses a full eight cups of broth with two potatoes, so it makes a lighter spoonable soup rather than a thick lentil purée. Rinse the lentils, cut the potatoes and carrots into small pieces, and soften the onion and garlic before adding the vegetables. Celery, thyme and dried parsley give the broth a familiar savory base. Red lentils break down quickly, usually in the same time it takes potatoes to become tender. Taste near the end and adjust seasoning without adding unsupported meat or cream. Serve the soup hot, with fresh parsley if available. This recipe is useful for a simple plant-based lunch.

Recipe card
Red Lentil Soup with Potato, Carrot and Celery
Equipment: Large soup pot, colander, ladle
Ingredients
Instructions
Rinse and cut
Rinse lentils; dice onion, carrots, potatoes and celery.
Soften
Cook onion and garlic in oil, then add carrots, potatoes and celery for 5 minutes.
Add lentils
Stir rinsed lentils through vegetables.
Simmer
Add broth, thyme and parsley; simmer 20–25 minutes until potatoes and lentils are tender.
Finish
Season to taste and serve hot.
How to tell when it is ready
Potatoes are fork-tender and red lentils are soft.
Tips
- Rinse lentils until water runs mostly clear.
- Cut potatoes small to match lentil cooking time.
- Add salt after tasting the broth.
- Thin leftovers with water if lentils absorb the broth.
Serving suggestions
- Top with fresh parsley.
- Serve with rye bread.
- Finish with lemon juice if desired.
- Pair with a crisp salad.
Make ahead
Prepare ingredients ahead and keep perishable items cold until cooking or serving.
Storage
Refrigerate cooled soup up to 3 days; thin when reheating if needed.
Food safety
Cool the large soup batch in shallow containers before refrigerating.
Frequently asked questions
Can I use green lentils?
They cook differently and need a longer simmer; this measured version uses red lentils.
How should I store red lentil soup with potatoes and celery?
Refrigerate cooled soup up to 3 days; thin when reheating if needed.
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