Potato Lentil Soup

Potato lentil soup is a simple Sicilian-style pot of brown or green lentils simmered with potatoes, carrots, celery, onion and a little tomato until the broth turns warm and lightly red. It is plant-based, filling and built on cheap pantry staples, the kind of Italian home cooking that stretches a bag of lentils into a full meal with bread. If you love hearty legume soups, also try this hearty lentil soup and this white bean and potato soup.

Why You’ll Love This Potato Lentil Soup

• One pot and simple steps: sauté the vegetables, add lentils and potatoes, simmer until tender.
• Budget-friendly: lentils, potatoes and a few aromatics feed a family for very little.
• Plant-based and filling: fiber-rich lentils and potatoes make a satisfying bowl without meat.
• Tomato-tinted broth: a spoon of tomato paste or a splash of passata gives color and gentle sweetness.
• Better the next day: the flavors deepen after a night in the refrigerator.

Ingredients for Potato Lentil Soup

For the soup

• 3 tablespoons olive oil
• 1 large onion, finely chopped
• 2 medium carrots, peeled and cut into chunks
• 2 celery stalks, diced
• 3 cloves garlic, minced
• 1 1/2 cups dry brown or green lentils, rinsed and picked over
• 1 lb potatoes, peeled and cut into 3/4-inch chunks
• 2 tablespoons tomato paste (or 1/2 cup passata)
• 6 cups vegetable broth or water, plus more as needed
• 1 bay leaf
• 1 teaspoon salt, plus more to taste
• 1/2 teaspoon black pepper
• 1/4 teaspoon chili flakes (optional)
• 1/4 cup chopped fresh parsley, plus more for serving

To serve

• Extra olive oil for drizzling
• Crusty bread

Optional extras

• 1 sprig fresh rosemary or a pinch of dried oregano (optional)
• A Parmesan rind simmered with the soup for extra savoriness if you are not keeping it fully plant-based (optional)
• A squeeze of lemon at the table (optional)

Ingredient Notes

• Lentils: brown or green lentils hold their shape in soup. Red lentils cook faster and turn soft, so save those for a different style of soup.
• Potatoes: waxy or all-purpose potatoes stay in neat chunks. Cut them similar in size so they cook evenly with the lentils.
• Tomato paste: frying the paste with the vegetables for a minute deepens the flavor and tints the broth. Passata gives a lighter tomato note.
• Broth or water: vegetable broth adds savoriness; water works if you season carefully and finish with a good olive oil.
• Parsley: stir most of it in at the end and save a little for the top, as in the photo.

How to Make Potato Lentil Soup

1. Sauté the base: heat the olive oil in a wide pot or deep pan over medium heat. Add the onion, carrots and celery and cook 8 to 10 minutes, until the onion is soft and lightly golden.
2. Add garlic and tomato: stir in the garlic for 30 seconds. Add the tomato paste and cook 1 minute, stirring, until it darkens slightly and coats the vegetables.
3. Add lentils and liquid: add the rinsed lentils, potatoes, broth or water, bay leaf, salt, pepper and chili flakes if using. Stir well and bring to a boil.
4. Simmer: lower the heat and simmer gently, partly covered, for 30 to 40 minutes, until the lentils and potatoes are tender. Stir now and then and add a splash of water if the soup gets too thick.
5. Finish: remove the bay leaf. Stir in most of the parsley. Taste and adjust salt and pepper. For a slightly thicker broth, mash a few potato chunks against the side of the pot and stir them back in.
6. Serve: ladle into bowls, top with the remaining parsley and a drizzle of olive oil. Serve with crusty bread.

Hands-on time is about 15 minutes, simmer time about 35 minutes. The recipe serves about 6.

Tips for the Best Potato Lentil Soup

• Rinse the lentils: a quick rinse removes dust and any small debris.
• Do not rush the onion: a soft, golden base builds the flavor of the whole pot.
• Keep a gentle simmer: a hard boil can break the potatoes and make the broth cloudy.
• Season at the end: lentils drink salt as they cook, so taste again before serving.
• Cool leftovers quickly: refrigerate soon after serving, following the FDA safe food handling tips.

What to Serve With Potato Lentil Soup

A slice of toasted crusty bread and a drizzle of olive oil are all this soup needs. For a bigger vegetable table, serve it beside a bowl of healing vegetable soup, a pot of lentil stew or a hearty vegan veggie stew.

Variations

• With greens: stir in chopped kale or spinach in the last 5 minutes.
• Smoky: add a pinch of smoked paprika with the tomato paste.
• More tomato: use 1 cup passata for a redder, thicker broth.
• Herbier: add a sprig of rosemary while the soup simmers and remove it before serving.
• Thicker stew: use 5 cups liquid instead of 6 for a spoon-standing consistency.

Storage

Store leftover soup in an airtight container in the refrigerator for up to 4 days. It thickens as it sits, so add a splash of water or broth when reheating. Potato lentil soup freezes well for up to 3 months. Cool completely, freeze in portions and thaw in the refrigerator overnight. Reheat gently on the stove. For freezing methods, see the National Center for Home Food Preservation freezing page.

FAQ

Do I need to soak the lentils?

No. Brown and green lentils cook tender in the soup without soaking. Just rinse them well.

Can I use red lentils?

You can, but they soften into a puree and the soup will look different. For chunky potato lentil soup like the photo, stick with brown or green lentils.

Is this soup vegan?

Yes, as written with olive oil and vegetable broth. Skip any optional cheese rind to keep it fully plant-based.

How do I keep the potatoes from falling apart?

Cut them into even chunks, simmer gently and avoid overcooking once they are tender.

Can I make potato lentil soup ahead?

Yes. It tastes even better the next day. Reheat with a little extra liquid and add fresh parsley just before serving.