French Lentil Soup (With Potatoes and Thyme)

This French lentil soup gives you a simple, nourishing one-pot dinner with tender lentils, hearty vegetables, and plenty of cozy flavor.

If you love comforting lentil recipes, try our curry lentil soup, Mediterranean lentil soup, or veggie-packed lentil vegetable soup next.

Close-up of French lentil soup with tender lentils, potatoes, and vegetables.

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Why you’ll love this French Lentil Soup!

This French lentil soup is simple, hearty, and packed with wholesome everyday ingredients. 🥕 French green lentils, potatoes, carrots, celery, and herbs simmer together in one pot for a cozy meal that’s satisfying without feeling heavy.

Despite the name, this soup could have come straight from my Italian nonna Lidia’s kitchen. We ate a lot of lentil soup growing up in Italy, and the earthy lentils, tender potatoes, and simple vegetables in this recipe immediately take me back to hers. ❤️

Louise and I love how easy, nourishing, and practical it is. Lentils make it naturally fiber-rich and protein-rich, while extra virgin olive oil and plenty of vegetables make it a wonderful fit for a Mediterranean-style eating pattern.

And for us, thick slices of crusty bread are a must. 🥖 Artisanal bread or a good sourdough is perfect for dipping into the savory broth and scooping up the lentils and potatoes. It’s simple food, but that’s exactly what makes it so satisfying.

P.S: French lentils aren’t the only way to make a satisfying lentil soup. Try our lemon lentil soup for something bright and fresh, creamy red lentil soup for a softer texture, or lentil noodle soup for an easy one-pot dinner.

Ingredients

Full ingredients and substitutions are in the recipe box below.

Ingredient overview easy french lentil soup in natural light.

Extra virgin olive oil: builds a rich, savory base. Substitute regular olive oil or avocado oil.
Onion: adds sweetness and depth. Yellow or white onion both work; use the green parts of scallions if you’re sensitive to onion.
Carrots: add natural sweetness and color. Substitute parsnips for an earthier flavor.
Celery: gives the broth classic aromatic flavor. Substitute fennel for a slightly sweeter note.
Garlic: adds savory depth. If garlic intolerant, omit it or use garlic-infused olive oil.
Tomato paste: adds concentrated savory flavor without making this a tomato soup. Substitute sun-dried tomato paste or omit it.
Bay leaves: add subtle herbal depth. Simply omit if unavailable.
Dried thyme: gives this rustic lentil soup its herby flavor. Substitute fresh thyme or herbes de Provence.
French green lentils: use dry, uncooked lentils, rinsed and drained. Substitute dry brown or green lentils. Canned lentils also work: drain, rinse, and add during the last 5–10 minutes. Reduce the broth since canned lentils won’t absorb as much liquid.
Potatoes: make this lentil potato soup hearty and satisfying. Yukon Gold or red potatoes work well.
Vegetable broth: forms the savory base. Reduced-sodium broth makes seasoning easier to control.
Red wine vinegar: brightens this green lentil soup beautifully. Substitute sherry vinegar or fresh lemon juice.
Italian parsley: optional for freshness and color. Substitute chives or fresh thyme.

French lentil soup in a bowl with tender lentils, potatoes, and carrots.

How to Make French Lentil Soup

1. Build the flavor base

Chop the onion, carrots, and celery into small, roughly even pieces so they soften at the same rate.

Heat the extra virgin olive oil in a large pot or Dutch oven over medium heat. Add the onion, carrots, and celery and cook for 7 to 8 minutes, stirring occasionally, until softened.

Mince or finely grate the garlic, then stir it in with the tomato paste, bay leaves, and dried thyme. Cook for about 1 minute, stirring often, until fragrant and the tomato paste darkens slightly.

Step 1 Onion, carrots, celery, garlic, tomato paste, and herbs cooking together.

2. Add the lentils and simmer

Rinse the dry lentils well under running water. Cut the potatoes into small bite-size pieces, about ¾-inch cubes, so they become tender around the same time as the lentils.

Add the lentils, potatoes, vegetable broth, salt, and black pepper. Stir well and bring to a boil.

Reduce the heat and simmer gently, partially covered, for 30 to 35 minutes. Stir a couple of times while it cooks to prevent sticking.

The soup is ready when the lentils are tender but still hold their shape and the potatoes are easily pierced with a fork. If it gets too thick, simply add a splash of broth or water.

Step 2 French lentils and diced potatoes gently simmering in savory vegetable broth.

3. Finish and serve

Remove the bay leaves and stir in the red wine vinegar. Taste and adjust the seasoning with more salt, pepper, or vinegar if needed.

Serve hot with optional chopped Italian parsley and a drizzle of extra virgin olive oil.

And don’t forget the bread! Thick slices of crusty artisanal or sourdough bread are perfect for dipping into the savory broth and scooping up the tender lentils and potatoes.

Step 3 Finished French lentil soup brightened with vinegar and topped with crushed pepper.

Serving Suggestions

Serve with crusty bread: Thick slices of sourdough or artisanal bread are perfect for dipping and make the soup even more satisfying.
Add Italian sausage: Brown sliced or crumbled Italian sausage in the pot first, then prepare the soup as written for a heartier, meatier version.
Add rotisserie chicken: Stir in shredded rotisserie chicken during the last 5 minutes of cooking for an easy protein boost.
Top with Parmesan: Finish each bowl with freshly grated Parmesan or Pecorino Romano for extra savory flavor.
Make it for meal prep: This soup keeps well and becomes even more flavorful as it sits, making it a practical make-ahead lunch or dinner.
Bring it to a potluck: Keep it warm in a slow cooker and serve with a basket of sliced crusty bread so everyone can help themselves.
Pair with a simple salad: Serve smaller bowls alongside a green salad, Caesar salad, or arugula salad for an easy soup-and-salad dinner.
Make it a cozy family dinner: Put the pot on the table with bread, Parmesan, parsley, and olive oil so everyone can customize their bowl

Tips

Use any brown or green lentils: French green lentils are delicious, but there’s no need to hunt them down. Regular brown or green lentils work just as well. Cooking time can vary slightly, so simmer until the lentils are tender but still hold their shape.
Rinse and check the lentils: Give dry lentils a good rinse in a fine-mesh strainer and quickly check for any small stones or debris.
Soften the vegetables first: Give the onion, carrots, and celery the full 7–8 minutes. This develops a sweeter, more flavorful base before you add the broth.
Cook the tomato paste: Let it cook with the garlic and herbs for about a minute. This takes away its raw taste and adds deeper savory flavor.
Keep it at a gentle simmer: Once the soup boils, turn down the heat. A steady, gentle simmer helps the lentils become tender without breaking apart.
Use the lentils as your timer: Different varieties, and even older lentils, can take longer to soften. The soup is done when the lentils are tender but still hold their shape and the potatoes are fork-tender.
Adjust the broth as it cooks: Lentils continue absorbing liquid, and the soup thickens as it sits. Add a splash of broth or water anytime you want a soupier consistency.
Save the vinegar for the end: Stir in the red wine vinegar after cooking so its bright flavor doesn’t get lost. Start with a little, taste, then add more if needed.
Taste before serving: Lentils and potatoes can soak up quite a bit of seasoning, so check the salt, pepper, and vinegar once everything is tender.
Don’t skip the crusty bread: A thick slice of artisanal or sourdough bread turns that savory broth into arguably the best part of the meal.

Close-up of French lentil soup showing tender lentils, potatoes, and vegetables.

Frequently Asked Questions

Do I have to use French green lentils?

No. French green lentils are excellent because they hold their shape, but regular brown or green lentils work just as well. Cooking times can vary slightly, so cook until tender.

Do I need to soak the lentils first?

No. Dry brown and green lentils do not need soaking for this recipe. Simply rinse them well before adding them to the pot.

Can I use canned lentils?

Yes. Drain and rinse canned lentils, then add them during the last 5 to 10 minutes of cooking. Start with less broth since cooked lentils won’t absorb as much liquid.

Why are my lentils taking longer to cook?

The cooking time can vary depending on the variety and age of your lentils. Older lentils often take longer to soften, so use their texture rather than the clock as your guide.

Can I make this vegetable lentil soup without potatoes?

Absolutely. You can leave them out or replace them with sweet potatoes, butternut squash, or another firm vegetable you enjoy.

Can I add meat?

Yes. Brown Italian sausage before cooking the vegetables, or stir shredded rotisserie chicken into the soup during the last few minutes. Both are easy ways to turn it into an even heartier dinner.

Can I make this lentil vegetable soup ahead of time?

Yes. It’s excellent for meal prep and tastes even better the next day. The lentils will continue absorbing broth, so you may want to add a splash of water or broth when reheating.

How to store this French lentil soup?

Let the soup cool, then refrigerate it in an airtight container for up to 4 days. Reheat it on the stovetop or in the microwave, adding a splash of broth or water if it has thickened.
You can also freeze it for up to 3 months. Thaw overnight in the refrigerator and reheat until hot, adding extra liquid as needed.

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