Lentil soup is a comforting, nutritious classic that’s simple to make and endlessly adaptable. Packed with protein-rich lentils, vegetables, and warming spices, this one-pot dish is perfect for weeknight dinners or meal prep. Whether you’re new to cooking or a seasoned home chef, this recipe (and the accompanying video) will walk you through every step for a delicious, satisfying soup.
Ingredients
- 2 tablespoons olive oil
- 1 large yellow onion, diced
- 2 medium carrots, peeled and diced
- 2 celery stalks, diced
- 3 garlic cloves, minced
- 1 1/2 cups dried brown or green lentils, rinsed
- 1 (14.5-ounce) can diced tomatoes, with juices
- 6 cups low-sodium vegetable broth (or chicken broth)
- 1 teaspoon ground cumin
- 1 teaspoon dried thyme
- 1 bay leaf
- 3/4 teaspoon salt, plus more to taste
- 1/2 teaspoon ground black pepper
- 2 cups chopped fresh spinach or kale
- 1 tablespoon lemon juice (about half a lemon)
- Optional: chopped fresh parsley, for garnish
- Optional: grated Parmesan cheese, for serving
Instructions
- Prepare the vegetables: Dice the onion, carrots, and celery. Mince the garlic. Rinse the lentils under cold water and drain.
- Sauté aromatics: In a large pot or Dutch oven, heat the olive oil over medium heat. Add the onion, carrots, and celery. Cook, stirring occasionally, until the vegetables begin to soften and the onion is translucent, about 6-8 minutes.
- Add garlic and spices: Stir in the minced garlic, cumin, and thyme. Cook for 1 minute, just until fragrant.
- Combine main ingredients: Add the rinsed lentils, diced tomatoes (with their juices), vegetable broth, bay leaf, salt, and pepper. Stir to combine.
- Simmer: Increase the heat to bring the soup to a boil. Once boiling, reduce the heat to low and cover. Simmer gently for 30-35 minutes, or until the lentils are tender but not falling apart. Stir occasionally and check the lentils for doneness after 25 minutes.
- Add greens: Remove the bay leaf. Stir in the chopped spinach or kale. Let the soup simmer uncovered for another 3-5 minutes, until the greens are wilted and tender.
- Finish with lemon: Stir in the lemon juice. Taste and adjust seasoning, adding more salt, pepper, or lemon juice as needed.
- Serve: Ladle the hot soup into bowls. Garnish with chopped parsley and a sprinkle of Parmesan cheese if desired. Enjoy with crusty bread!
Tips
- Lentil choice: Brown or green lentils hold their shape best. Red lentils cook faster and result in a creamier texture but may become mushy.
- Make it vegan: Use vegetable broth and skip the Parmesan cheese. For extra flavor, add a teaspoon of smoked paprika or a splash of soy sauce.
- Bulk it up: Add diced potatoes, sweet potatoes, or bell peppers with the carrots for a heartier soup.
- Don’t overcook: Lentils can turn mushy if simmered too long. Start checking for tenderness at 25 minutes.
Serving Suggestions
Lentil soup is delicious on its own, but it pairs beautifully with a slice of crusty sourdough or whole-grain bread. For a Mediterranean touch, serve with a side of Greek salad or a dollop of plain yogurt. If you like a bit of heat, offer crushed red pepper flakes or a drizzle of chili oil at the table. For a complete meal, serve with a simple green salad or roasted vegetables on the side.
Variations
- Curried lentil soup: Add 1-2 teaspoons curry powder with the spices. Swap lemon juice for lime juice and garnish with cilantro.
- Sausage and lentil soup: Brown 8 ounces of sliced smoked sausage or Italian sausage with the onions before adding the rest of the vegetables.
- Tomato-free: Omit the canned tomatoes and add an extra cup of broth. Add a pinch more lemon juice for brightness.
- Herby lentil soup: Add 1/4 cup chopped fresh herbs such as parsley, dill, or basil to the soup just before serving for extra freshness.
- Blended for creaminess: For a smoother soup, use an immersion blender to puree part of the soup in the pot, or blend 2 cups in a blender and stir back in.
Storage and Reheating
Lentil soup stores exceptionally well, making it ideal for meal prep. Allow the soup to cool to room temperature before transferring to airtight containers. Store in the refrigerator for up to 5 days. For longer storage, freeze portions in freezer-safe containers for up to 3 months. To reheat, warm the soup gently on the stove over medium-low heat, stirring occasionally, until hot (about 7-10 minutes from the fridge, 15-20 minutes from frozen). You can also microwave single servings for 2-3 minutes, stirring halfway through. If the soup thickens after storage, add a splash of water or broth to loosen it to your desired consistency.
Frequently Asked Questions
- Do I need to soak lentils before making soup?
No soaking is required for brown or green lentils. Simply rinse them under cold water to remove dust or debris. Red lentils also do not require soaking and cook even faster. - Can I use canned lentils?
Yes, you can substitute 2 (15-ounce) cans of drained lentils. Add them after simmering the vegetables and tomatoes; reduce the total cook time to about 15 minutes, as canned lentils are already cooked. - How can I make lentil soup more flavorful?
Building flavor starts with sautéing the vegetables and spices. For deeper taste, add a parmesan rind to simmer, a splash of balsamic vinegar or lemon juice at the end, or stir in chopped fresh herbs. Using a high-quality broth also makes a difference. - Is lentil soup healthy?
Yes, lentil soup is high in plant-based protein, fiber, vitamins, and minerals, while being low in fat. Using minimal oil and plenty of vegetables keeps it light but filling. Adjust the salt and toppings to suit your dietary needs. - Can I make lentil soup in a slow cooker?
Absolutely. Sauté the vegetables as directed, then transfer everything to a slow cooker. Cook on low for 7-8 hours or high for 3-4 hours, until the lentils are tender. Add greens and lemon juice just before serving. - Why did my lentils stay hard?
Old lentils, acidic ingredients (like tomatoes), or hard water can prevent lentils from softening. If using old lentils, they may take longer to cook. Try simmering a bit longer, or add tomatoes after the lentils have cooked most of the way.
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