Spring Lentil Vegetable Soup with Herb Pistou

When spring vegetables are at their freshest, this Spring Lentil Vegetable Soup with Herb Pistou is the perfect way to let them shine. Tender green lentils simmer with sweet peas, crisp asparagus, silky spinach, and fragrant leeks to create a light yet satisfying soup packed with wholesome ingredients.

The real star, though, is the homemade spring herb pistou. Made with fresh herbs, garlic, lemon, and extra-virgin olive oil, this simple sauce adds a bright, garlicky burst of flavor to every bowl. Just stir a spoonful into the warm soup and watch the flavors come alive.

This easy lentil soup is perfect for a light lunch, a simple weeknight dinner, or a cozy spring meal served with a thick slice of crusty bread.

Why You’ll Love This Recipe

• Packed with spring vegetables: Asparagus, peas, spinach, and leeks give the soup fresh seasonal flavor.
• Hearty but light: Green lentils make the soup filling without making it heavy.
• Bright and flavorful: Fresh lemon and herb pistou add plenty of freshness to every bite.
• Easy to customize: Swap in your favorite vegetables and fresh herbs depending on what you have available.
• Great for meal prep: The soup freezes beautifully, making it convenient for future lunches and dinners.

Ingredients

For the Soup

• Green or brown lentils: These provide protein, fiber, and a hearty texture. Avoid red lentils, which will break down during cooking.
• Extra-virgin olive oil: Used to sauté the leeks and garlic and add richness.
• Leeks: Their mild onion flavor creates a flavorful base for the soup.
• Garlic: Adds savory depth to both the soup and pistou.
• Chicken or vegetable broth: Provides the liquid and savory foundation. Use vegetable broth to keep the soup vegetarian or vegan.
• Peas: Fresh or frozen peas add natural sweetness and a bright green color.
• Asparagus: Cut into small pieces so it cooks quickly while retaining some texture.
• Baby spinach or arugula: Adds another layer of green vegetables and fresh flavor.
• Fresh lemon juice: Brightens the finished soup.
• Salt and black pepper: Adjust to taste.

For the Spring Herb Pistou

• Extra-virgin olive oil: Forms the base of the pistou.
• Fresh garlic: Gives the sauce its characteristic garlicky flavor.
• Fresh herbs: Use a combination of mint, dill, chives, and cilantro, or choose one or two favorites.
• Salt: Enhances the flavor of the herbs.
• Lemon zest: Adds concentrated citrus flavor.
• Fresh lemon juice: Brings acidity and freshness.
• Crushed red pepper: Optional, but adds a subtle kick.

How to Make Spring Lentil Vegetable Soup with Herb Pistou

Step 1: Soak the Lentils

About 30 minutes before cooking, place the green or brown lentils in a bowl and cover them with warm water. Add about ½ tablespoon of kosher salt and let them soak.

Soaking is optional, but it can improve the texture of the lentils and help break down some of their indigestible fibers. You can also soak them in cold water and refrigerate them overnight.

Once soaked, drain and rinse the lentils thoroughly.

Step 2: Sauté the Leeks and Garlic

Heat the olive oil in a large heavy pot or Dutch oven over medium heat.

Add the sliced and thoroughly cleaned leeks and cook for about 5 minutes, stirring occasionally, until softened.

Add the minced garlic and cook for another 30 seconds, just until fragrant.

Step 3: Simmer the Lentils

Pour in the broth and bring it to a boil.

Add the drained lentils, then reduce the heat to low. Cover the pot and simmer for about 20 minutes, or until the lentils are tender.

If the soup becomes too thick, add a little more broth or water.

If you skipped soaking the lentils, they may need additional cooking time and extra liquid.

Step 4: Make the Spring Herb Pistou

While the lentils are cooking, prepare the pistou.

Add the garlic, fresh herbs, salt, lemon zest, lemon juice, and optional crushed red pepper to a food processor. Pulse until the herbs and garlic are finely chopped.

With the processor running, slowly drizzle in the olive oil until the mixture becomes a loose, herb-filled sauce.

You can also make the pistou with an immersion blender, mortar and pestle, or simply chop everything finely by hand and stir it together in a bowl.

Step 5: Add the Spring Vegetables

Once the lentils are tender, stir in the peas, asparagus, and baby spinach or arugula.

Cook over low heat for about 5 minutes, just until the asparagus is tender but still has some bite and the greens have wilted.

Avoid overcooking the asparagus—the slight crunch adds a lovely contrast to the tender lentils.

Step 6: Finish and Season

Turn off the heat and stir in the fresh lemon juice.

Taste the soup and season with salt and black pepper as needed. The amount of salt required will depend on the broth you use.

If the soup is thicker than you prefer, add a little more broth or water.

Step 7: Serve with Herb Pistou

Ladle the soup into bowls and add a generous dollop of fresh herb pistou to each serving.

Serve immediately with thick slices of crusty bread for dipping.

Tips for Success

• Use green or brown lentils: Red lentils are not suitable because they break down much more quickly and will change the texture of the soup.
• Clean leeks thoroughly: Dirt can hide between the layers, so rinse them well after slicing.
• Don’t overcook the vegetables: Add the asparagus, peas, and greens near the end so they retain their fresh flavor and texture.
• Taste before adding salt: Broths vary significantly in sodium, so season the soup after cooking.
• Don’t skip the herbs: The pistou gives this soup much of its fresh spring character. If you skip the pistou, add plenty of freshly chopped herbs to the finished soup.
• Adjust the consistency: Add additional broth or water if the soup becomes too thick.
• Make extra pistou: Any leftover pistou can be stirred into the soup before freezing or saved separately for a fresher flavor later.

Equipment Needed

• Large heavy pot or Dutch oven
• Cutting board and sharp knife
• Food processor, immersion blender, or mortar and pestle
• Colander for rinsing lentils and cleaning leeks
• Ladle for serving

Recipe Variations

Make It Vegan

Use vegetable broth instead of chicken broth. The soup is naturally vegan when made with vegetable stock.

Use Different Herbs

The pistou is very flexible. Try basil, parsley, mint, dill, chives, cilantro, or tarragon. You can use one favorite herb or combine several.

Add More Vegetables

For extra heartiness, add slow-cooking vegetables such as diced carrots or potatoes along with the lentils. Broccoli, chopped kale, or cauliflower can be added toward the end with the asparagus and peas.

Use Canned Lentils

For a quicker version, use canned lentils. Drain and rinse them well, then add them after bringing the broth to a boil, along with the asparagus, peas, and spinach.

You can also substitute other canned beans, such as cannellini beans or chickpeas.

Make It Spicy

Add a little extra crushed red pepper to the pistou or sprinkle it directly over each serving for more heat.

Serving Suggestions

This spring lentil soup is delicious on its own, but a few simple additions can turn it into a complete meal.

Serve it with:

• Crusty artisan bread
• Homemade garlic bread
• A simple green salad
• Roasted vegetables
• A drizzle of extra-virgin olive oil
• Extra fresh herbs
• A little additional lemon juice

For the best presentation, add the pistou just before serving so the vibrant green herbs remain fresh and fragrant.

How to Store and Freeze

Store leftover soup in an airtight container in the refrigerator for several days.

This soup also freezes very well. You can stir the remaining pistou into the soup before freezing for convenience, freeze the pistou separately, or make a fresh batch when reheating the soup.

If freezing the pistou separately, keeping it apart from the soup will give you a fresher herb flavor when serving.

FAQs

Can I use canned lentils instead of dried lentils?

Yes. Drain and rinse the canned lentils well. Add them after the broth comes to a boil, along with the asparagus, peas, and spinach. Since canned lentils are already cooked, they don’t need the same simmering time as dried lentils.

Do I have to soak the lentils?

No, soaking is optional. However, soaking can improve their texture and may make them easier to digest. If you skip soaking, allow extra cooking time and add more broth or water if necessary.

Can I use frozen peas?

Absolutely. Frozen peas work very well in this recipe and don’t need to be thawed before adding them.

Can I make the soup without the pistou?

Yes, but the pistou adds a particularly fresh flavor to the soup. If you’re short on time, skip the pistou and stir plenty of freshly chopped herbs into the soup before serving. A drizzle of good olive oil also helps finish the dish.

Can I use other vegetables?

Definitely. Carrots and potatoes can be added earlier with the lentils because they take longer to cook. Broccoli, kale, and cauliflower can be added later with the asparagus and peas.

Is this soup vegan?

Yes, when made with vegetable broth. If you use chicken broth, the soup will not be vegetarian or vegan.

Final Thoughts

Spring Lentil Vegetable Soup with Herb Pistou is a wonderful example of how simple ingredients can create a meal full of fresh, vibrant flavor. The tender lentils make it satisfying, while asparagus, peas, spinach, and leeks bring a lighter seasonal touch.

The homemade herb pistou takes the soup to another level, adding garlic, lemon, fresh herbs, and olive oil to every spoonful. Whether you’re making it for a quick lunch, a healthy family dinner, or meal prep, this easy lentil soup is a delicious way to enjoy the flavors of spring.

For the best experience, serve it warm with crusty bread and plenty of fresh pistou spooned over the top.

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