Lentil and Sweet Potato Soup

This lentil and sweet potato soup uses fridge and pantry staples and comes together in about 40 minutes — hearty, warmly spiced, and finished with a squeeze of lemon.

At A Glance

⏱ Ready In: 40 minutes (15 min prep, 25 min cook)
🍽 Serves: 4-6
🌱 Diet: Vegan, Vegetarian, Gluten-Free
💪 Nutrition Highlights: High in fiber and plant-based protein
🥕 Main Ingredients: Brown lentils, sweet potato, onion, carrot, celery, lemon
🔥 Flavor Profile: Hearty and savory, a little sweet from the sweet potato, earthy lentils, brightened with lemon
🧊 Meal-Prep Friendly: Keeps 4-5 days in the fridge and freezes well
Best Served With: A thick slice of sourdough or high-protein bread

This is the soup you make on a weeknight when you don’t want to think too hard about dinner but still want something that actually fills you up. It’s built almost entirely from fridge and pantry staples — canned lentils, a sweet potato, some vegetables you probably already have — so there’s no special shopping trip required.

The sweet potato breaks down slightly as it cooks, giving the soup a little natural creaminess, while the lentils add that earthy, savory backbone. A squeeze of lemon at the end cuts through the richness and keeps it from tasting flat.

It’s loosely inspired by Turkish and Middle Eastern lentil soups, with the sweet potato swapped in for extra body and a gentle sweetness that plays well against the smoked paprika and cumin. Serve it with a piece of good bread, and you’ve got a properly satisfying, protein-and-fiber-packed dinner without much effort.

👩‍🍳 You might also like these lentil recipes: chicken lentil soup, curried coconut red lentil soup, Mediterranean chickpea soup, vegetarian Stroganoff (lentil & mushroom), lentil mushroom bolognese, or tuna lentil salad. You might also like my white bean and chicken soup.

What You’ll Need

Here is what you’ll need for this lentil and sweet potato soup recipe. Find the full measurements in the recipe card below.

Onion, celery, carrot – the classic soup base; finely dicing them helps everything soften evenly and build flavor early
Sweet potato – adds natural sweetness and a slightly creamy texture once it breaks down; peel and cube it so it cooks quickly
Garlic – for depth; add it after the vegetables have softened so it doesn’t burn
Cumin, coriander seed powder, smoked paprika, sweet paprika, dried thyme (or oregano), pepper – this spice mix is what gives the soup its warm, savory character; smoked paprika in particular adds a lovely depth
Brown lentils, canned – the protein and fiber powerhouse of this soup; using canned lentils keeps things quick, but you could cook your own from dry if you prefer
Tomato passata (or canned diced tomatoes) – adds body and a little acidity to balance the sweetness
Vegetable stock – the base liquid; use a good-quality stock or stock cubes for the best flavor
Lemon zest and juice – stirred in at the end, this is what keeps the soup from tasting heavy or one-note
To serve: sour cream or yogurt, fresh cilantro or parsley, chili flakes for a bit of heat

How To Make Lentil and Sweet Potato Soup

Find the full recipe and nutritional information below. Here’s a quick overview of how it comes together.

Peel and dice the onion, celery, carrot, sweet potato, and garlic.
Heat olive oil in a heavy pot and sauté the onion, carrot, and celery with salt over medium heat for about 10 minutes, until nicely softened.
Add the garlic, sweet potato, spices, and herbs, and stir for a minute until fragrant.
Add the lentils, tomato passata (or canned tomatoes) and stock.
Bring to a boil, then simmer until the sweet potato is soft, about 15-20 minutes.
Stir in the lemon zest, lemon juice and a little extra salt to taste.
Use a potato masher to break down some of the sweet potato and lentils — this gives the soup a slightly creamy, mushy texture without needing a blender.
Serve as is, or with a dollop of sour cream or yogurt, fresh cilantro, and a pinch of chili flakes.

Recipe Tips

Don’t skip the mashing step. Even a few passes with a potato masher makes a real difference to the texture, giving you that creamy, hearty consistency without any blending or cream.
Layer the salt. A pinch when you sauté the vegetables, then adjust again at the end after the lemon goes in — this builds better flavor than salting once at the finish.
Swap the herbs. Dried oregano works just as well as thyme here if that’s what you have on hand.
Storage: Keeps well in the fridge for 4-5 days in an airtight container.
Freezer-friendly: Cool completely, then freeze in portions for up to 3 months. Thaw and reheat gently on the stove, adding a splash of stock or water if it’s thickened up too much.
Make it your own: Stir in a handful of spinach or kale at the end for extra greens, or top with crumbled feta if you’re not keeping it vegan.

Serving Suggestions

A thick slice of sourdough or high-protein bread is really all you need alongside this soup — something to mop up the bowl with. A dollop of sour cream or yogurt on top adds a nice tang and creaminess, and fresh cilantro (or parsley, if that’s what you prefer) brightens it up. If you like a bit of heat, a pinch of chili flakes on top goes a long way. This also makes a great meal-prep lunch — just pack it into containers and reheat when you’re ready.

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A hearty, warmly spiced soup made with lentils and sweet potato, finished with lemon. Ready in about 40 minutes and made almost entirely from pantry staples. Find step-by-step photos and more recipe tips above.

Peel and dice all the vegetables and the garlic.
In a heavy pot, heat the olive oil over medium heat. Add the onion, carrot, and celery with the salt, and sauté for about 10 minutes, until nicely softened.
Add the garlic, sweet potato, spices and herbs, and stir for 1 minute, until fragrant.
Add the lentils, tomato passata (or canned tomatoes) and stock.
Bring to a boil, then reduce the heat and simmer until the sweet potato is soft, about 15-20 minutes.
Once cooked, stir in the lemon zest, lemon juice, and another ¼ to ½ teaspoon salt, to taste.
Use a potato masher to break down some of the sweet potato and lentils, giving the soup a creamy, slightly mushy texture.
Serve as is, or with a dollop of sour cream or yogurt, fresh cilantro (or parsley), and a sprinkle of chili flakes on top.

Important Ingredient Tips: Canned brown lentils keep this recipe quick — just make sure to drain them well. If you’d rather cook lentils from dry, you’ll need roughly 3 cups cooked lentils to replace the two cans.
Key Recipe Tips: Mash a portion of the soup with a potato masher for the best texture — it’s a quick step but makes a big difference. Layer your salt for better flavor: a pinch while sautéing, then adjust again at the end.
Storage Tips: Store in an airtight container in the fridge for up to 4-5 days.
Make-Ahead Tips: This soup freezes beautifully — cool completely, then freeze in portions for up to 3 months. Thaw overnight in the fridge and reheat gently on the stove, adding a splash of stock or water if needed.
FAQs:
Can I use dry lentils instead of canned? Yes — you’ll need about 1 cup dry brown lentils, added along with the stock, and simmered until tender (this may take a little longer, closer to 25-30 minutes).
Is this soup gluten-free? Yes, as written it’s naturally gluten-free. Just double-check your stock and canned lentils don’t contain any hidden additives.
Can I make this soup smooth instead of chunky? Absolutely — use an immersion blender instead of a potato masher for a fully smooth, blended texture.
What can I use instead of sweet potato? Pumpkin or butternut squash both work well as a swap, with a similar cooking time.

Keywords: lentil soup, lentil and sweet potato soup, sweet potato lentil soup, easy vegan soup, Middle Eastern lentil soup

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