This garlicky lentil potato soup with freshly crisped crunchy croutons is both hearty and healthy. It comes together quickly and makes a soul-warming family supper. Make it tonight!

A close up of a bowl of lentil potato soup topped with croutons.
Photo Credits: Ali Redmond

As soon as temps turn cooler, I pull out my soup pot and grab a bag of lentils from the pantry. It’s time for lentil potato soup! My Italian mother made this hearty one-dish meal every fall, and I’ve since followed in her footsteps.

My mother’s native region of Abruzzo, Italy, is known for its rustic cuisine featuring vegetables, grains like farro, and legumes like beans, chickpeas, and lentils. 

In the high plains of the Apennine mountains, lentils are grown to be small in size and chestnut brown in color, with lots of earthy flavor. Today, I use whatever lentils I have on hand to recreate her soup. 

This includes the brownish-purple lentils from Abruzzo, the slightly paler, greener lentils from Umbria known as Lenticchie di Castelluccio, or the easier-to-source French green lentils. Each variety keeps its shape even when cooked at length, which means they make fantastic soup.

Infused with the flavor of garlic and herbs, the hearty creaminess of potatoes, and finished with homemade croutons, this vegan soup recipe ticks all the boxes. Italian comfort food at its best!

Table of Contents
  1. What is in Lentil Potato Soup?
  2. Ingredient Spotlight
  3. How to Make Lentil Potato Soup
    1. Make the Base
  4. Finish and Simmer
    1. Optional: Make the Croutons
    2. Finish and Serve
  5. Ways to Mix it Up 
  6. What to Serve with Lentil Potato Soup
  7. More Lentil Soup and Stew Recipes
  8. Lentil Potato Soup Recipe
Ingredients for lentil potato soup including lentils, potato, olive oil, garlic, celery, onion, fennel, peperoncino, thyme, a bay leaf, salt, broth, cubed bread, and black pepper.

What is in Lentil Potato Soup?

A handful of ingredients—most of which you probably already have in your pantry and fridge—is all it takes to get a pot of garlicky lentil soup going. Here’s what you’ll need to make it.

  • Lentils: Use green or brown varieties (see Ingredient Spotlight below for more).
  • Extra-virgin olive oil: You’ll need a good quality olive oil for cooking your soup, and a top-notch drizzling oil for serving, like our buttery-smooth Italian Nocellara.
  • Garlic: In general, Italian cooking uses less garlic than most people assume. Often, a clove is used to flavor oil for sauce or soup, and then removed and discarded. In this case, though, more garlic is better! I add anywhere from four to six lightly crushed cloves, depending on how garlic-forward I want the flavor to be.
  • Celery and onion: Serve as the foundation for this fall soup.
  • Fennel: It’s not traditional, but I always add a diced fennel bulb to my lentil potato soup. It imparts an appealing, mellow sweetness with only the barest hint of anise flavor.
  • Chili pepper: A pinch of red pepper flakes, or a small fresh chili pepper punches up the base for lentil potato soup. It’s not mandatory, but I love the hint of heat it provides.
  • Aromatics: A few sprigs of thyme and a whole bay leaf add an extra layer of flavor.
  • Potato: One large yellow potato, cut into cubes, gives body to lentil potato soup. Once the pieces soften in the broth, take the time to mash a few of them against the side of the pot to add even more structure.
  • Broth: If you have homemade vegetable broth (or chicken stock) all the better. However, a good commercial brand works fine here.
  • Croutons: Crunchy homemade croutons are the crowning glory of this soup. They are easy to make—just toss bread cubes with olive oil and bake while the soup is simmering on the stovetop. A good crusty bread is preferred, and feel free to use homemade. 
An overhead photo of a bowl of lentil potato soup with a spoon, topped with croutons. Next to this is a spoon, a cloth napkin, a bottle of olive oil, and a pot with the rest of the soup.

Ingredient Spotlight

This tiny coin-shaped legume comes in a variety of colors that share similarities but are also different. Brown and green lentils, common in Italian and French cooking, have an appealing earthy, slightly peppery flavor, and they tend to hold their shape during cooking. 

Red and yellow lentils, common in Middle Eastern and Indian cooking, range in color from golden to deep orange. They have a pleasing nutty taste and tend to fall apart during cooking.

For this recipe, you’ll need green or good brown Italian lentils, if you can find them (I buy them when I’m in Italy or order them online). The best lentils for this soup are the brownish-purple lentils from Abruzzo and the slightly paler, greener lentils from Umbria, known as Lenticchie di Castelluccio.

Both really do keep their shape without breaking down as they cook. Look for them in gourmet or international groceries. French puy lentils also work well, or even plain brown supermarket lentils will do; that’s what my mom used when she couldn’t find her beloved Italian lentils, and we loved her lentil soup either way.

An overhead photo of a pot of lentil potato soup with a wooden spoon.

How to Make Lentil Potato Soup

A little chopping and sautéing is all it takes to make an Italian-style lentil potato soup. All told it takes just about an hour from start to finish. It’s hearty enough to serve as a one-dish meal, or as a main course accompanied by a salad and a glass of vino.

Make the Base

  • Get ready. Rinse 2 cups green or brown lentils thoroughly in a fine mesh strainer and be sure to pick out any tiny stones or other debris. Set aside. If you’re serving with croutons, preheat the oven to 400°F.
  • Prep your aromatics and veggies. Lightly crush 4-6 garlic cloves. Finely dice 1 large celery rib, 1 medium yellow onion, and 1 small fennel bulb. Peel and cut 1 medium yellow potato into 1/2-inch cubes. 
  • Sauté the aromatics. Pour 1/4 cup olive oil into a Dutch oven or other heavy-bottomed pot and set on medium-low heat. Stir in the garlic, celery and onion, fennel. Season with 1 fresh or dried peperoncino chili pepper (or a big pinch of chili flakes), 3 thyme sprigs, and 1 bay leaf. Cook until the vegetables are softened and their perfume starts to fill the kitchen, about 7 minutes. Season with 1 teaspoon sea salt.The aromatics for the soup being sauteed in a pot with a wooden spoon.
  • Add the potatoes and lentils. Add the potatoes and stir to coat them with oil. Add 1 cup of chicken or vegetable broth and turn the heat to medium. Bring the mixture to a simmer over medium heat, then cover partly and cook at a gentle simmer until the potatoes have started to soften, about 10 minutes. Stir in the rinsed lentils.

Finish and Simmer

  • Add the broth and simmer. Pour in the remaining 3 cups broth, plus the 4 cups water. Use a wooden spoon or silicone spatula to mash some of the softened potatoes against the side of the pot; this will help to thicken the soup. Turn the heat to high to bring the soup to a boil, then lower the heat to simmer and cover partially. Simmer gently for 45 minutes, or until the vegetables are tender and the lentils are cooked through.The aromatics, potatoes and lentils for the soup being sauteed in a pot with a wooden spoon.

Optional: Make the Croutons

  • Make the croutons (optional). While the soup is simmering, cut enough bread into 1/2-inch cubes to make 2 cups. Add to a bowl and toss with 2 tablespoons olive oil, sprinkle with salt and pepper, and spread them out on a baking sheet. Bake in the hot oven until evenly browned and crisp, about 15 minutes.An overhead photo of baked croutons on a sheet pan.

Finish and Serve

  • Serve. Remove the soup from the heat. Discard the thyme sprigs, bay leaf, chili pepper, and any garlic cloves that haven’t melted into the soup—or leave them in, as I do (I like to mash them up). Ladle the soup into bowls, drizzle with your best olive oil, and scatter a small handful of croutons on top of each serving.An overhead photo of a bowl of lentil potato soup with a spoon, topped with croutons. Is a cloth napkin and a baking sheet with the rest of the croutons.

Ways to Mix it Up 

As much as I love lentil soup the way my mom made it, I also love to mix it up a bit. Sometimes I omit the croutons and serve the soup with focaccia on the side. Here are other ways to switch things up:

  • Add a diced turnip to the vegetables, for extra earthy flavor.
  • Toss in a few handfuls of chopped Swiss chard, kale, or spinach and let the greens cook down with the vegetables and aromatics.
  • Tuck a Parmesan rind into the soup as it’s simmering. Its rich flavor will infuse the broth.
An overhead photo of 2 bowl of lentil potato soup topped with croutons, one with a spoon. Next to these are 2 glasses of water, a bottle of olive oil, and a bowl of red pepper flakes.

What to Serve with Lentil Potato Soup

This soup is so hearty and nourishing, it can be served as a one-dish meal. It also pairs well with lots of dishes, so feel free to serve smaller portions as a first course or make it the main event with a side. Lentil soup goes great with a fresh salad. Try it with this crunchy Fennel Salad with Shaved Parmesan or this peppery Radicchio Salad with Orange.

More Lentil Soup and Stew Recipes

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Lentil Potato Soup

Domenica Marchetti
An overhead photo of a bowl of lentil potato soup with a spoon, topped with croutons. Next to this is a spoon, a cloth napkin, a bottle of olive oil, and a pot with the rest of the soup.
This comforting recipe is hearty, satisfying, and endlessly useful, equally as perfect for a cozy weeknight dinner as it is for a dinner party appetizer. It's also great for a wide variety of diets but will leave no one hungry: Make it vegan by using vegetable broth, and gluten free by skipping the croutons or using gluten free bread.
Prep – 10 minutes
Cook – 1 hour
Total – 1 hour 10 minutes
Cuisine:
Italian
Serves – 6
Course:
Entree, Soup

Ingredients
  

For the soup

  • 2 cups green lentils or small Italian brown lentils
  • 1/4 cup extra virgin olive oil, plus more for drizzling
  • 4 to 6 large garlic cloves, lightly crushed
  • 1 large celery rib, finely diced
  • 1 medium yellow onion, finely diced
  • 1 small fennel bulb, finely diced
  • 1 fresh or dried peperoncino (or a generous pinch of crushed red pepper)
  • 3 thyme sprigs
  • 1 bay leaf (fresh or dried)
  • 1 teaspoon sea salt (or to taste)
  • 1 medium yellow potato, peeled and cut into 1/2-inch cubes
  • 4 cups vegetable broth (or chicken broth)
  • 4 cups water

For the croutons (optional)

  • 2 cups cubed bread (1/2 inch cubes)
  • 2 tablespoons extra virgin olive oil
  • Kosher salt
  • Black pepper

Instructions
 

  • Get ready. Rinse the lentils thoroughly in a fine mesh strainer and be sure to pick out any tiny stones or other debris. Set aside. If you’re serving with croutons, preheat the oven to 400°F.
  • Sauté the aromatics. Pour the olive oil into a Dutch oven or other heavy-bottomed pot and set on medium-low heat. Stir in the garlic, celery and onion, fennel, chili pepper, thyme sprigs, and bay leaf. Cook until the vegetables are softened and their perfume starts to fill the kitchen, about 7 minutes. Season with the salt.
  • Add the potatoes and lentils. Add the potatoes and stir to coat them with oil. Add 1 cup of broth and turn the heat to medium. Bring the mixture to a simmer over medium heat, then cover partly and cook at a gentle simmer until the potatoes have started to soften, about 10 minutes. Stir in the rinsed lentils.
  • Add the broth and simmer. Pour in the remaining 3 cups broth, plus the 4 cups water. Use a wooden spoon or silicone spatula to mash some of the softened potatoes against the side of the pot; this will help to thicken the soup. Turn the heat to high to bring the soup to a boil, then lower the heat to simmer and cover partially. Simmer gently for 45 minutes, or until the vegetables are tender and the lentils are cooked through.
  • Make the croutons. While the soup is simmering, toss the bread cubes in a bowl with 2 tablespoons olive oil, sprinkle with salt and pepper, and spread them out on a baking sheet. Bake in the hot oven until evenly browned and crisp, about 15 minutes.
  • Serve. Remove the soup from the heat. Discard the thyme sprigs, bay leaf, chili pepper and any garlic cloves that haven’t melted into the soup—or leave them in, as I do (I like to mash them up). Ladle the soup into bowls, drizzle with your best olive oil, and scatter a small handful of croutons on top of each serving.

Notes

  • Shop this recipe: Visit our shop to browse quality Mediterranean ingredients including the olive oil and green lentils used in this recipe.
  • Nutrition calculation does not include the optional croutons. 

Nutrition

Calories: 365kcalCarbohydrates: 52.3gProtein: 18.1gFat: 9.8gSaturated Fat: 1.4gPolyunsaturated Fat: 1.4gMonounsaturated Fat: 6.7gSodium: 1055.2mgPotassium: 981.8mgFiber: 22.1gSugar: 5.4gVitamin A: 472.6IUVitamin C: 18.9mgCalcium: 77.2mgIron: 5.6mg
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Domenica Marchetti is the author of eight books on Italian home cooking, including “Williams-Sonoma Everyday Italian,” “Preserving Italy: Canning, Curing, Infusing, and Bottling Italian Flavors and Traditions,” and “The Glorious Pasta of Italy.” When she’s not writing or creating recipes, Domenica teaches Italian cooking classes on Zoom and leads occasional small-group culinary tours and workshops in Italy.
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Comments

  1. Lisa says:

    This soup has all of the ingredients that I love! Can’t wait to make it! I adore lentils!